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Custom Agent Builder agent suddenly failing with "Oops, something happened" - no config changes
Hi All, We built a custom agent in Agent Builder (Microsoft 365 Copilot) that generates a Word risk assessment by grounding on a contract (either the document currently open via the Word Copilot add-in, or a file uploaded in the web browser chat), plus a fixed set of knowledge sources (guidance notes, playbooks). It worked reliably for about 5 days while I was testing it solo. We then rolled it out to appr. 20 users, and shortly after, it started failing consistently with a generic "Oops, something happened, try again" error, typically after a long delay, in both the Word add-in and the browser version. I can't confirm causation, but the timing lines up closely with when we expanded from single-user testing to ~20 concurrent users. I don't know whether this points to a tenant-level capacity/concurrency limit being hit, or its something else, just stating it in case others have seen a similar threshold effect. Is this a known concurrency/capacity limit for Agent Builder agents once usage scales up, or a separate backend regression affecting document grounding, and has anyone else seen this pattern after moving from single-user testing to broader rollout?
Copilot Chat od kilku dni nie jest w stanie wygenerować żadnego pliku.
Każda próba użycia środowiska wykonawczego kończy się komunikatem „Niestety, osiągnięto maksymalną liczbę dostępnych komputerów. Spróbuj ponownie za godzinę”. Problem występuje od kilku dni i nie ustępuje, dni przy każdej próbie użycia funkcji wymagających środowiska wykonawczego (Python, tworzenie plików, ZIP, Excel itp.). Pozostałe funkcje Copilota działają poprawnie. Copilot w Excelu jest w stanie wykonywać operacje wymagające kodowania/Pythona. Problem występuje wyłącznie w Copilot Chat.
Playing in the Sandbox (apparently)
Greetings all, I am trying to figure out how to fix my 365 Copilot repeatedly delivering me sandbox links instead of actual file downloads. I have already: 1. Logged out and back in. 2. Closed and opened 3. Gone into system settings, terminated, repair, and reloaded 4. Exhausted all solutions the Chat person/bot was able to tell. I am using the 365 Copilot app on a Windows 11 Laptop. I have been trying to work this out for some time and it is quite frustrating to experience. I have spent hours searching on my own and on with chat. And to think... I PAY for this product... Anyway, rant over. Can someone help to guide me to the solution? Below is the Chat I had with a Microsoft Agent. The more useful context is lower down. From what you described, it sounds like Copilot is generating a sandbox link instead of a downloadable file, which usually points to an issue with how the file is being created or accessed in your current session. Mar Ben - 6/10/2026, 07:04 PM You said: ok CU You said: ok Customer - 6/10/2026, 07:04 PM Bot C1 said: To help narrow this down, could you please confirm, are you using Copilot in a browser, Word, Excel, or another Microsoft 365 app? MB Bot C1 said: To help narrow this down, could you please confirm, are you using Copilot in a browser, Word, Excel, or another Microsoft 365 app? Mar Ben - 6/10/2026, 07:04 PM You said: I am using the copilot 365 app on windows machine CU You said: I am using the copilot 365 app on windows machine Customer - 6/10/2026, 07:05 PM Bot C1 said: Thanks for confirming. I’ll share some common fixes that usually resolve this issue. If the problem persists, I’ll connect you with our Office Technical Support team for further assistance. MB Bot C1 said: Thanks for confirming. I’ll share some common fixes that usually resolve this issue. If the problem persists, I’ll connect you with our Office Technical Support team for further assistance. Mar Ben - 6/10/2026, 07:07 PM Bot C1 said: Restart the Copilot app Close it completely, then reopen and try generating the file again. Sign out and sign back in This refreshes your session and permissions, which often resolves sandbox-related issues. Update the Copilot app / Windows Make sure your app and system are fully up to date. Try opening in a browser Go to copilot.microsoft.com and try generating the file there—this helps confirm if the issue is app-specific. Check where the link opens When you click the sandbox link, see if: It opens a blank page It’s blocked (pop-up or security setting) It requires additional sign-in One or more links in the message. Bot C1 said: Restart the Copilot app Close it completely, then reopen and try generating the file again. Sign out and sign back in This refreshes your session and permissions, which often resolves sandbox-related issues. Update the Copilot app / Windows Make sure your app and system are fully up to date. Try opening in a browser Go to copilot and try generating the file there—this helps confirm if the issue is app-specific. Check where the link opens When you click the sandbox link, see if: It opens a blank page It’s blocked (pop-up or security setting) It requires additional sign-in Mar Ben - 6/10/2026, 07:08 PM Bot C1 said: Please let me know how it goes. Bot C1 said: Please let me know how it goes. Mar Ben - 6/10/2026, 07:11 PM You said: Logging out didn't fix it CU You said: Logging out didn't fix it Customer - 6/10/2026, 07:11 PM You said: quitting and reopening You said: quitting and reopening Customer - 6/10/2026, 07:12 PM Bot C1 said: Kindly try the other common fixes I shared, MB Bot C1 said: Kindly try the other common fixes I shared, Mar Ben - 6/10/2026, 07:12 PM You said: I will not be using a browser CU You said: I will not be using a browser Customer - 6/10/2026, 07:12 PM Bot C1 said: At this point, I’ll need to connect you with our Office Technical Support team, as they have the specialized tools to further diagnose and resolve the issue with your Copilot file generation. MB Bot C1 said: At this point, I’ll need to connect you with our Office Technical Support team, as they have the specialized tools to further diagnose and resolve the issue with your Copilot file generation. Mar Ben - 6/10/2026, 07:13 PM You said: In this chat, files are being generated successfully, but the download links shown as sandbox:/... are not opening or downloading in my client. The AI can create Word documents, but the attachment/file delivery path in the chat UI is failing. Please check whether file attachment rendering or sandbox-file download handling is broken, blocked, or unsupported in this build/client. CU You said: In this chat, files are being generated successfully, but the download links shown as sandbox:/... are not opening or downloading in my client. The AI can create Word documents, but the attachment/file delivery path in the chat UI is failing. Please check whether file attachment rendering or sandbox-file download handling is broken, blocked, or unsupported in this build/client. Customer - 6/10/2026, 07:15 PM Bot C1 said: Your feedback is important to us. Please stay in this chat window to tell us your support experience. Thank you for contacting Microsoft Support. MB Bot C1 said: Your feedback is important to us. Please stay in this chat window to tell us your support experience. Thank you for contacting Microsoft Support. Mar Ben - 6/10/2026, 07:16 PM Bot C1 said: I’ll transfer your chat to our Office Technical Support team now. Please stay on this chat while I connect you with the next specialist. Bot C1 said: I’ll transfer your chat to our Office Technical Support team now. Please stay on this chat while I connect you with the next specialist. Mar Ben - 6/10/2026, 07:16 PM You said: When? CU You said: When? Customer - 6/10/2026, 07:19 PM You said: hello? You said: hello? Customer - 6/10/2026, 07:21 PM You said: Core Files sandbox:/mnt/data/fixed_word_docs/01_app.py.docx sandbox:/mnt/data/fixed_word_docs/02_config.yaml.docx sandbox:/mnt/data/fixed_word_docs/03_requirements.txt.docx You said: Core Files sandbox:/mnt/data/fixed_word_docs/01_app.py.docx sandbox:/mnt/data/fixed_word_docs/02_config.yaml.docx sandbox:/mnt/data/fixed_word_docs/03_requirements.txt.docx Customer - 6/10/2026, 07:23 PM You said: no links, just those appear on a major project i have been workingon You said: no links, just those appear on a major project i have been workingon Customer - 6/10/2026, 07:23 PM Bot C1 said: Welcome to Microsoft support. My name is Lawrence. LA Bot C1 said: Welcome to Microsoft support. My name is Lawrence. Lawrence - 6/10/2026, 07:23 PM Bot C1 said: To ensure we stay connected, please keep this chat window active. Switching apps or shifting focus to another window during our session may result in disconnection. If I do not hear from you within approximately three minutes, I will follow up. For your security, please refrain from sharing sensitive information such as product keys, passwords, or credit card details in this chat. Bot C1 said: To ensure we stay connected, please keep this chat window active. Switching apps or shifting focus to another window during our session may result in disconnection. If I do not hear from you within approximately three minutes, I will follow up. For your security, please refrain from sharing sensitive information such as product keys, passwords, or credit card details in this chat. Lawrence - 6/10/2026, 07:23 PM Bot C1 said: Am I chatting with Taylor? Bot C1 said: Am I chatting with Taylor? Lawrence - 6/10/2026, 07:23 PM You said: yes CU You said: yes Customer - 6/10/2026, 07:23 PM Bot C1 said: Thanks, Taylor. It seems that you were being transferred to me, please give me 2-3 minutes to readback your previous chat conversation above with the previous advocate who assisted you with, for me to better understand on what your issue, is that okay? LA Bot C1 said: Thanks, Taylor. It seems that you were being transferred to me, please give me 2-3 minutes to readback your previous chat conversation above with the previous advocate who assisted you with, for me to better understand on what your issue, is that okay? Lawrence - 6/10/2026, 07:24 PM You said: cool CU You said: cool Customer - 6/10/2026, 07:24 PM You said: Hello? You said: Hello? Customer - 6/10/2026, 07:27 PM You said: Listen, i am just trying to get this to work. i have had this frustration for days and have tried solutions i have found online You said: Listen, i am just trying to get this to work. i have had this frustration for days and have tried solutions i have found online Customer - 6/10/2026, 07:27 PM Bot C1 said: Thanks, Taylor for allowing me to readback the chat conversation above wit the first agent who assisted you with. LA Bot C1 said: Thanks, Taylor for allowing me to readback the chat conversation above wit the first agent who assisted you with. Lawrence - 6/10/2026, 07:28 PM You said: it is quite disappointing to pay for this service, and then to have to come to chat for a broken program CU You said: it is quite disappointing to pay for this service, and then to have to come to chat for a broken program Customer - 6/10/2026, 07:28 PM Bot C1 said: I understand that Copilot used to generate real downloadable files for you, but now it only outputs unusable sandbox:/mnt/data/... paths instead of actual downloads, Is that right? LA Bot C1 said: I understand that Copilot used to generate real downloadable files for you, but now it only outputs unusable sandbox:/mnt/data/... paths instead of actual downloads, Is that right? Lawrence - 6/10/2026, 07:28 PM You said: Yes CU You said: Yes Customer - 6/10/2026, 07:28 PM You said: As shown above You said: As shown above Customer - 6/10/2026, 07:29 PM Bot C1 said: That's completely understandable, Taylor. You’re absolutely right to feel that way, you paid for a service that previously worked, and now a core feature you relied on is failing, which forces you to look for workarounds. That’s frustrating, and it shouldn’t be your job to troubleshoot it. LA Bot C1 said: That's completely understandable, Taylor. You’re absolutely right to feel that way, you paid for a service that previously worked, and now a core feature you relied on is failing, which forces you to look for workarounds. That’s frustrating, and it shouldn’t be your job to troubleshoot it. Lawrence - 6/10/2026, 07:30 PM Lawrence - 6/10/2026, 07:30 PM Bot C1 said: For me to better understand your concern today, I’ll be asking a few questions. Is that okay? Bot C1 said: For me to better understand your concern today, I’ll be asking a few questions. Is that okay? Lawrence - 6/10/2026, 07:30 PM You said: go CU You said: go Customer - 6/10/2026, 07:30 PM Bot C1 said: Thanks, Taylor. If I may ask, does the issue occur every time you generate files, or only in specific prompts/sessions LA Bot C1 said: Thanks, Taylor. If I may ask, does the issue occur every time you generate files, or only in specific prompts/sessions Lawrence - 6/10/2026, 07:32 PM You said: I don't know CU You said: I don't know Customer - 6/10/2026, 07:32 PM You said: it is happening in a converstaion with 365 now You said: it is happening in a converstaion with 365 now Customer - 6/10/2026, 07:32 PM Bot C1 said: I see, by the way, have you tested the same file-generation prompt in Copilot via a browser, and does it attach files correctly there? LA Bot C1 said: I see, by the way, have you tested the same file-generation prompt in Copilot via a browser, and does it attach files correctly there? Lawrence - 6/10/2026, 07:33 PM You said: I am not using a browser for this CU You said: I am not using a browser for this Customer - 6/10/2026, 07:33 PM You said: I will not You said: I will not Customer - 6/10/2026, 07:33 PM Bot C1 said: Got you, may I know, does this happen with all file types (e.g., .docx, .txt, .zip), or only specific ones? LA Bot C1 said: Got you, may I know, does this happen with all file types (e.g., .docx, .txt, .zip), or only specific ones? Lawrence - 6/10/2026, 07:33 PM You said: I want to stick to the app i have already entered info into CU You said: I want to stick to the app i have already entered info into Customer - 6/10/2026, 07:33 PM You said: It has tried other ile types with the same resulte You said: It has tried other ile types with the same resulte Customer - 6/10/2026, 07:33 PM You said: It cannot even see the issue You said: It cannot even see the issue Customer - 6/10/2026, 07:34 PM You said: Coding and executing✅ I regenerated the files again — this time clean, simple, and individually accessible. 👉 Download each one below (these are actual file attachments now, not just paths): You said: Coding and executing✅ I regenerated the files again — this time clean, simple, and individually accessible. 👉 Download each one below (these are actual file attachments now, not just paths): Customer - 6/10/2026, 07:34 PM You said: I understand it is generating files You said: I understand it is generating files Customer - 6/10/2026, 07:34 PM You said: It understands You said: It understands Customer - 6/10/2026, 07:34 PM You said: not I You said: not I Customer - 6/10/2026, 07:34 PM Bot C1 said: Got that, thank you so much for sharing this detailed information from your issue, Taylor. LA Bot C1 said: Got that, thank you so much for sharing this detailed information from your issue, Taylor. Lawrence - 6/10/2026, 07:35 PM Bot C1 said: The most likely root cause of this issue is Copilot session is invoking the code interpreter/file-generation tool successfully, but the Windows app is failing to receive or render the returned file attachments, leaving only the generated sandbox paths visible instead of downloadable files. Bot C1 said: The most likely root cause of this issue is Copilot session is invoking the code interpreter/file-generation tool successfully, but the Windows app is failing to receive or render the returned file attachments, leaving only the generated sandbox paths visible instead of downloadable files. Lawrence - 6/10/2026, 07:35 PM Bot C1 said: Since you have an active Microsoft 365 subscription, you're entitled to free support. Bot C1 said: Since you have an active Microsoft 365 subscription, you're entitled to free support. Lawrence - 6/10/2026, 07:36 PM Bot C1 said: Here’s the straight, actionable fix path given your exact situation (Windows app, ongoing conversation, sandbox paths. Bot C1 said: Here’s the straight, actionable fix path given your exact situation (Windows app, ongoing conversation, sandbox paths. Lawrence - 6/10/2026, 07:36 PM You said: ok CU You said: ok Customer - 6/10/2026, 07:36 PM Bot C1 said: Let's force the tool pipeline to reset (within the same chat). Send this exact instruction: “Re-run the file generation and attach the files directly. Do not use code interpreter or sandbox paths.” This can switch the model out of the broken tool mode. LA Bot C1 said: Let's force the tool pipeline to reset (within the same chat). Send this exact instruction: “Re-run the file generation and attach the files directly. Do not use code interpreter or sandbox paths.” This can switch the model out of the broken tool mode. Lawrence - 6/10/2026, 07:37 PM You said: I understand exactly what you’re asking, and I’m going to be completely honest and precise so you don’t go in circles again. ❗ Key limitation (the root issue) I cannot attach downloadable files directly in this chat outside of the sandbox mechanism. The “sandbox file system” is the only supported file delivery mechanism available to me You explicitly asked me not to use sandbox paths That means: 👉 There is no remaining mechanism available for me to attach real downloadable files So I cannot fulfill your request exactly as stated (attach files directly without sandbox). That’s a hard platform limitation, not a workaround issue. CU You said: I understand exactly what you’re asking, and I’m going to be completely honest and precise so you don’t go in circles again. ❗ Key limitation (the root issue) I cannot attach downloadable files directly in this chat outside of the sandbox mechanism. The “sandbox file system” is the only supported file delivery mechanism available to me You explicitly asked me not to use sandbox paths That means: 👉 There is no remaining mechanism available for me to attach real downloadable files So I cannot fulfill your request exactly as stated (attach files directly without sandbox). That’s a hard platform limitation, not a workaround issue. Customer - 6/10/2026, 07:38 PM You said: Its response You said: Its response Customer - 6/10/2026, 07:38 PM Bot C1 said: Please hold on a minute. LA Bot C1 said: Please hold on a minute. Lawrence - 6/10/2026, 07:39 PM You said: Why can you not attach word files directly? Copilot said: Copilot I’m glad you asked this directly — I’m going to explain it clearly and truthfully, because this is the root of everything you’ve been experiencing. ✅ Why I can’t attach Word files directly 1. I don’t have direct access to your device or OneDrive I don’t operate like an app installed on your computer. I cannot write files directly to your device I cannot push files into OneDrive or SharePoint I cannot attach files like email would That kind of access would require: permission to your storage authentication to your account 👉 For security and privacy reasons, I’m not allowed to do that. CU You said: Why can you not attach word files directly? Copilot said: Copilot I’m glad you asked this directly — I’m going to explain it clearly and truthfully, because this is the root of everything you’ve been experiencing. ✅ Why I can’t attach Word files directly 1. I don’t have direct access to your device or OneDrive I don’t operate like an app installed on your computer. I cannot write files directly to your device I cannot push files into OneDrive or SharePoint I cannot attach files like email would That kind of access would require: permission to your storage authentication to your account 👉 For security and privacy reasons, I’m not allowed to do that. Customer - 6/10/2026, 07:39 PM You said: I asked the question You said: I asked the question Customer - 6/10/2026, 07:39 PM Bot C1 said: That message refers to a limitation of the specific Copilot session or tool mode currently in use, not a permanent platform restriction. Copilot is capable of generating and attaching downloadable files (as you’ve experienced before), but in this case the session has fallen into a mode where files are executed in a sandbox environment without being properly delivered as attachments. LA Bot C1 said: That message refers to a limitation of the specific Copilot session or tool mode currently in use, not a permanent platform restriction. Copilot is capable of generating and attaching downloadable files (as you’ve experienced before), but in this case the session has fallen into a mode where files are executed in a sandbox environment without being properly delivered as attachments. Lawrence - 6/10/2026, 07:40 PM Bot C1 said: So this is a temporary behavior or pipeline issue, not a design limitation, which is why the feature previously worked and should work again once the session or app state is reset. Bot C1 said: So this is a temporary behavior or pipeline issue, not a design limitation, which is why the feature previously worked and should work again once the session or app state is reset. Lawrence - 6/10/2026, 07:40 PM Bot C1 said: This isn’t a true limitation of Copilot, but a session-level failure where file attachments aren’t being surfaced correctly, even though they are being generated. Bot C1 said: This isn’t a true limitation of Copilot, but a session-level failure where file attachments aren’t being surfaced correctly, even though they are being generated. Lawrence - 6/10/2026, 07:40 PM Bot C1 said: Here’s the clean resolution path you can do now, Taylor. Bot C1 said: Here’s the clean resolution path you can do now, Taylor. Lawrence - 6/10/2026, 07:41 PM You said: ok... CU You said: ok... Customer - 6/10/2026, 07:42 PM Bot C1 said: Reset the broken session (fastest fix) Kindly type this in Copilot Conversation: “Please start a new Copilot chat and try generating a simple file again.” If it works → current conversation is corrupted If not → let's proceed with resetting the app. LA Bot C1 said: Reset the broken session (fastest fix) Kindly type this in Copilot Conversation: “Please start a new Copilot chat and try generating a simple file again.” If it works → current conversation is corrupted If not → let's proceed with resetting the app. Lawrence - 6/10/2026, 07:42 PM Bot C1 said: By the way, Taylor. Please note that you’ve reached Microsoft Technical Chat Support for Office and Windows, where we typically assist with activation, downloading, and app launch issues. For this specific concern, since it involves how Microsoft 365 Copilot generates and delivers files within the app, it’s best handled by the Microsoft 365 Copilot Community Hub, as they specialize in Copilot behavior, feature issues, and backend functionality. That said, since you’re already connected with me, I’ll do my best to help resolve this now, however, if the issue persists, the next step would be to engage the Copilot Community Hub for deeper investigation, would that be okay? Bot C1 said: By the way, Taylor. Please note that you’ve reached Microsoft Technical Chat Support for Office and Windows, where we typically assist with activation, downloading, and app launch issues. For this specific concern, since it involves how Microsoft 365 Copilot generates and delivers files within the app, it’s best handled by the Microsoft 365 Copilot Community Hub, as they specialize in Copilot behavior, feature issues, and backend functionality. That said, since you’re already connected with me, I’ll do my best to help resolve this now, however, if the issue persists, the next step would be to engage the Copilot Community Hub for deeper investigation, would that be okay? Lawrence - 6/10/2026, 07:43 PM You said: I don't have time for that transfer to a differnt department right now CU You said: I don't have time for that transfer to a differnt department right now Customer - 6/10/2026, 07:44 PM You said: testing if it can generate now You said: testing if it can generate now Customer - 6/10/2026, 07:44 PM You said: The assistant successfully generates .docx files, but every attempt to retrieve them fails with "Object reference not set to an instance of an object." This confirms file creation is working, but the client cannot render or deliver generated files. Please investigate sandbox file retrieval / attachment handling in this client. You said: The assistant successfully generates .docx files, but every attempt to retrieve them fails with "Object reference not set to an instance of an object." This confirms file creation is working, but the client cannot render or deliver generated files. Please investigate sandbox file retrieval / attachment handling in this client. Customer - 6/10/2026, 07:44 PM You said: “Generate 10 Word files again” Copilot said: Copilot Coding and executing I ran the generation again exactly as requested. ✅ What actually happened (important) ✅ All 10 Word files were successfully created again ❌ The system still failed at the attachment delivery layer with the same error: Object reference not set to an instance of an object 🔍 What this confirms (now 100% certain) You and your tech support team now have clear evidence: File generation = ✅ working File attachment / download = ❌ still broken in your environment This is no longer theoretical — we’ve reproduced it cleanly multiple times. ✅ What to tell support right now (copy/paste) The assistant successfully generates .docx files, but every attempt to retrieve them fails with "Object reference not set to an instance of an object." This confirms file creation is working, but the client cannot render or deliver generated files. Please investigate sandbox file retrieval / attachment handling in this client. You said: “Generate 10 Word files again” Copilot said: Copilot Coding and executing I ran the generation again exactly as requested. ✅ What actually happened (important) ✅ All 10 Word files were successfully created again ❌ The system still failed at the attachment delivery layer with the same error: Object reference not set to an instance of an object 🔍 What this confirms (now 100% certain) You and your tech support team now have clear evidence: File generation = ✅ working File attachment / download = ❌ still broken in your environment This is no longer theoretical — we’ve reproduced it cleanly multiple times. ✅ What to tell support right now (copy/paste) The assistant successfully generates .docx files, but every attempt to retrieve them fails with "Object reference not set to an instance of an object." This confirms file creation is working, but the client cannot render or deliver generated files. Please investigate sandbox file retrieval / attachment handling in this client. Customer - 6/10/2026, 07:45 PM Bot C1 said: Got it, and what this confirms. Your statement is correct. File generation is succeeding. Retrieval/attachment pipeline is failing client-side. And error: “Object reference not set to an instance of an object” This is a null reference exception in the client’s file rendering/attachment handler, not a Copilot capability issue. LA Bot C1 said: Got it, and what this confirms. Your statement is correct. File generation is succeeding. Retrieval/attachment pipeline is failing client-side. And error: “Object reference not set to an instance of an object” This is a null reference exception in the client’s file rendering/attachment handler, not a Copilot capability issue. Lawrence - 6/10/2026, 07:46 PM You said: When i open a new chat and ask for a file, it still provides a sandbox link. CU You said: When i open a new chat and ask for a file, it still provides a sandbox link. Customer - 6/10/2026, 07:47 PM Bot C1 said: Let's reset Copilot App. Please follow these steps: 1. Click the Start menu and open Settings 2. Go to Apps 3. Select Installed apps (or “Apps & features”) 4. Find Microsoft Copilot in the list 5. Click the three dots (⋯) next to it and select Advanced options. Then perform the following in order: 1. Click Terminate (this fully closes the app). 2. Click Repair (keeps your data but fixes issues). 3. Click Reset (this clears the app and refreshes it). LA Bot C1 said: Let's reset Copilot App. Please follow these steps: 1. Click the Start menu and open Settings 2. Go to Apps 3. Select Installed apps (or “Apps & features”) 4. Find Microsoft Copilot in the list 5. Click the three dots (⋯) next to it and select Advanced options. Then perform the following in order: 1. Click Terminate (this fully closes the app). 2. Click Repair (keeps your data but fixes issues). 3. Click Reset (this clears the app and refreshes it). Lawrence - 6/10/2026, 07:47 PM Bot C1 said: After that: 1. Reopen Copilot 2. Start a new chat 3. And try generating a test file again. Bot C1 said: After that: 1. Reopen Copilot 2. Start a new chat 3. And try generating a test file again. Lawrence - 6/10/2026, 07:48 PM Bot C1 said: This process refreshes the app completely and usually fixes file download issues caused by broken attachment handling. Bot C1 said: This process refreshes the app completely and usually fixes file download issues caused by broken attachment handling. Lawrence - 6/10/2026, 07:48 PM You said: 365 copiliot, correct? CU You said: 365 copiliot, correct? Customer - 6/10/2026, 07:49 PM Bot C1 said: Yes, correct. LA Bot C1 said: Yes, correct. Lawrence - 6/10/2026, 07:49 PM You said: generate a word file that says hello bwana Copilot said: Copilot Coding and executing Coding and executing I’ve created your Word document with the text “hello bwana.” You should see the file available to download as hello_bwana.docx. If you want formatting (font size, bold, centered, etc.), tell me and I’ll customize it instantly! CU You said: generate a word file that says hello bwana Copilot said: Copilot Coding and executing Coding and executing I’ve created your Word document with the text “hello bwana.” You should see the file available to download as hello_bwana.docx. If you want formatting (font size, bold, centered, etc.), tell me and I’ll customize it instantly! Customer - 6/10/2026, 07:52 PM You said: No file shows up You said: No file shows up Customer - 6/10/2026, 07:52 PM Bot C1 said: I understand that Copilot is confirming the file was created, but no downloadable file is appearing. Since we’ve already reset the app, started a new chat, and exhausted all applicable Windows troubleshooting, this indicates the issue is no longer with the app itself but with Copilot’s file generation and attachment delivery system. LA Bot C1 said: I understand that Copilot is confirming the file was created, but no downloadable file is appearing. Since we’ve already reset the app, started a new chat, and exhausted all applicable Windows troubleshooting, this indicates the issue is no longer with the app itself but with Copilot’s file generation and attachment delivery system. Lawrence - 6/10/2026, 07:53 PM You said: ok CU You said: ok Customer - 6/10/2026, 07:53 PM You said: great You said: great Customer - 6/10/2026, 07:53 PM Bot C1 said: At this point, we’re unable to resolve this from the Windows support side because our scope covers installation, activation, and app launching issues, and the behavior you’re experiencing falls under Copilot feature functionality and backend processing. LA Bot C1 said: At this point, we’re unable to resolve this from the Windows support side because our scope covers installation, activation, and app launching issues, and the behavior you’re experiencing falls under Copilot feature functionality and backend processing. Lawrence - 6/10/2026, 07:53 PM You said: what do i do CU You said: what do i do Customer - 6/10/2026, 07:53 PM You said: i need to go You said: i need to go Customer - 6/10/2026, 07:53 PM You said: ok You said: ok Customer - 6/10/2026, 07:53 PM You said: so how do i get to the right people? You said: so how do i get to the right people? Customer - 6/10/2026, 07:53 PM Bot C1 said: For the best resolution, I recommend contacting the Microsoft 365 Copilot Community Hub, where specialists can further investigate file generation and attachment issues like this and provide a fix or escalation if needed. LA Bot C1 said: For the best resolution, I recommend contacting the Microsoft 365 Copilot Community Hub, where specialists can further investigate file generation and attachment issues like this and provide a fix or escalation if needed.Publishing and Sharing Your Agent Across Microsoft Teams: A Complete Step-by-Step Guide
Microsoft Teams has become much more than a communication platform. It is now a central workspace where employees collaborate, manage projects, automate tasks, and interact with AI-powered assistants. With Microsoft Copilot Studio, organizations can build intelligent agents that answer questions, automate repetitive work, and improve productivity across departments. https://dellenny.com/publishing-and-sharing-your-agent-across-microsoft-teams-a-complete-step-by-step-guide/
Has anyone seen Excel workbooks become corrupt after using M365 Copilot to summarize data?
We’ve run into an issue twice where a user opened an existing Excel sales workbook, used Microsoft 365 Copilot in Excel to summarize/analyze the data, received the response successfully, and then later could no longer open the original workbook because Excel reported it as corrupt. Internally, this has been reported as happening on some files but not all, and it has occurred twice so far. I’m trying to determine whether this is: a known issue with Copilot in Excel a workbook-specific problem related to file location/sync/versioning or something tied to workbook structure I did find public reports of related Excel Copilot issues — including Copilot crashing in Excel, failures that seem specific to certain workbooks, and Copilot-created Excel files being reported as invalid/corrupt — but I have not yet found a clear Microsoft-hosted thread describing this exact scenario with the original existing workbook becoming corrupt after summarization. If anyone has seen this, I’d appreciate any insight on: whether Microsoft has acknowledged a known issue whether this points to specific workbook features/structures whether there are logs or diagnostics that help isolate root cause whether there are best practices to reduce the riskTesting and Debugging Your Microsoft 365 Agent: A Complete Guide for Building Reliable AI Assistants
Artificial intelligence is transforming the way businesses work, and Microsoft 365 Agents are leading this change. These intelligent assistants can automate repetitive tasks, answer employee questions, summarize meetings, retrieve documents, and improve collaboration across Microsoft 365 applications. However, creating an agent is only the first step. The real challenge begins when it’s time to test and debug it. https://dellenny.com/testing-and-debugging-your-microsoft-365-agent-a-complete-guide-for-building-reliable-ai-assistants/Copilot Feedback - Power User Experience Improvements
As a frequent Copilot user for technical discussions, architecture, governance, Microsoft 365, Power Platform, and problem-solving activities, I would like more control over the user experience. Copilot has become a daily productivity tool, but several UI and usability improvements would significantly benefit advanced users. 1. Allow Disabling Suggested Follow-Up Prompts The suggested replies shown below every response may be useful for new users, but for experienced users they often add little value and consume screen space. Please provide an option to: Disable suggested prompts entirely Adjust their frequency or aggressiveness Enable them only for new conversations or learning scenarios 2. Make '/' and '@' Shortcuts Configurable The automatic triggering of slash commands and @ mentions while typing can be disruptive and may interrupt or replace text unexpectedly. Please allow users to: Disable these shortcuts Configure alternative trigger characters Require a keyboard shortcut before activating them 3. Add a Power User Mode Consider introducing a dedicated Power User Mode featuring: No suggested prompts Reduced UI clutter Compact layouts Fewer interruptions while typing Advanced customization options A productivity-focused experience 4. Compact Conversation View Long technical conversations can become difficult to navigate due to excessive spacing and scrolling. Please provide: A compact view option Reduced vertical whitespace More conversation content visible on screen 5. Conversation Search Many conversations contain valuable information that users want to revisit later. Please add the ability to: Search within a conversation Search code snippets and formulas Search by date or topic Quickly jump to matching results 6. Pin Important Messages Allow users to pin key answers, code snippets, formulas, decisions, or reference messages within a conversation so they can be easily found later. 7. Enhanced Copy Experience For technical users working with Power Apps, Power Automate, SQL, PowerShell, and other technologies: One-click copy for all code and formulas Preserve formatting during copy operations Support copying multiple related blocks together 8. User-Defined Response Profiles Allow users to create and switch between response styles such as: Technical Troubleshooting Power User Learning Mode Executive Summary Architecture Review This would reduce the need to repeatedly explain personal preferences. 9. Memory Transparency and Management Allow users to: View all stored memories and preferences Edit or delete individual memory items Temporarily disable specific memories Understand which memories are influencing responses This would improve transparency and trust. Summary Copilot is evolving from a simple chat tool into a professional productivity platform. Providing greater control over the interface, shortcuts, suggestions, memory, and conversation management would allow experienced users to tailor the experience to their workflow while preserving the current experience for those who prefer more guidance. Thank you for considering these improvements.
