todo
33 TopicsTasks sync failure - Outlook web vs mobile Outlook vs desktop Outlook
--- # 📄 **Technical Report: Persistent Outlook Web App Sync Failure Affecting Microsoft To Do / Outlook Tasks Ecosystem** **Issue Duration:** At least 3 months probably more **Platforms Affected:** - Microsoft To Do (Android) - Outlook Tasks (Windows Desktop Outlook) - Outlook Tasks (Outlook Web App) - Exchange Online (backend sync service) --- ## 1. **Executive Summary** I have experience **persistent, intermittent, and platform‑specific synchronization failures** within the Microsoft To Do / Outlook Tasks ecosystem. The critical finding is: ### **The Outlook Web App is often isolated and does not sync with any other platform.** Meanwhile: - **Windows Desktop Outlook ↔ Android To Do sync perfectly in both directions.** - **Outlook Web App ↔ (Desktop / Android)** do not sync. This isolates the issue to the **web app’s sync pipeline**, not the task data, not the account, and not the other apps. The failures present as: - **“Synchronization in progress”** stuck indefinitely - **“Synchronization failed”** when manually attempting sync - Web app showing **stale, outdated, or incomplete task lists** - Web app failing to send or receive updates from Exchange Online The same tasks that fail to sync for hours later sync successfully without any modification, proving the data is not corrupted and the failure is backend‑related. --- ## 1.1 **Cross‑Platform Sync Behavior (Critical Diagnostic Insight)** ### ✔ **Windows Desktop Outlook ↔ Android To Do** - Full two‑way sync - Immediate updates - Reliable and consistent ### ✖ **Outlook Web App ↔ Desktop Outlook** - No sync in either direction ### ✖ **Outlook Web App ↔ Android To Do** - No sync in either direction ### ✖ **Outlook Web App ↔ Exchange Online** - Appears to be failing or stalling This proves the web app is **not participating in the sync ecosystem**. --- ## 2. **Symptoms Observed** ### 2.1 **Outlook Web App** - Sync button stuck on **“Synchronization in progress”** for hours - Manual sync results in **“Synchronization failed”** - Web app shows outdated task lists - Web app does not receive updates from desktop or mobile - Web app does not send updates to desktop or mobile ### 2.2 **Android To Do** - Tasks created on Android do not appear in the web app - Tasks created in the web app do not appear on Android - Edits fail to propagate to the web app - Manual sync does not resolve the issue - Logout/login sometimes helps, inconsistently ### 2.3 **Windows Desktop Outlook** - Syncs perfectly with Android - Does not sync with the web app - Shows correct, up‑to‑date task data ### 2.4 **Platform Sync Matrix** | Action | Desktop Outlook | Android To Do | Outlook Web App | |--------|-----------------|---------------|------------------| | Create/edit task on **Desktop** | ✔ Syncs to Android | ✔ | ✖ No sync to Web | | Create/edit task on **Android** | ✔ Syncs to Desktop | ✔ | ✖ No sync to Web | | Create/edit task on **Web** | ✖ No sync to Desktop | ✖ | ✔ Stays only on Web | **Conclusion:** The Outlook Web App is **fully isolated** from Exchange Online’s task sync pipeline. --- ## 3. **Troubleshooting Steps Already Attempted** ### 3.1 **Web App** - Hard refresh (Ctrl + Shift + R) - Full browser cache clear - Logout → close browser → reopen → login - Switching lists to force metadata reload - Creating tasks to trigger sync events - Deleting tasks to force backend updates ### 3.2 **Android** - Manual sync - Clear cache - Logout/login - Device restart - Network switching - Creating/completing tasks to trigger sync ### 3.3 **Desktop Outlook** - Verified account health - Verified Exchange Online connectivity - Verified task folder integrity ### 3.4 **Account / Backend** - Verified Microsoft Account stability - Verified no multi‑account conflicts - Verified Exchange Online service health None of these steps produce consistent or lasting resolution. --- ## 4. **Frequency and Pattern** - Occurs multiple times per week - Occurs regardless of recent task edits - Occurs across multiple browsers - Occurs across multiple Android versions - Sync resumes randomly after hours - Sync resumes without any data changes - Sync resumes after logout/login, but inconsistently This pattern strongly suggests **backend sync token stalling**. --- ## 5. **Technical Analysis** ### 5.1 **Two‑Way Sync Failure Confined to Web App** Because: - Desktop ↔ Android works - Web ↔ (Desktop / Android) fails The failure is isolated to the **web app’s connection to Exchange Online**. ### 5.2 **Sync Token Stalling (Most Likely Cause)** Symptoms match known sync token stall behavior: - Endless “Synchronization in progress” - Manual sync fails - Sync resumes randomly - Sync resumes after forced metadata refresh - Sync resumes after unrelated actions (e.g., completing a task) ### 5.3 **Not a Corrupted Task Issue** Because the same tasks later sync successfully: - No malformed tasks - No unsupported metadata - No blocked sync queue - No corrupted lists ### 5.4 **Backend Sync Pipeline Instability** The pipeline: **Web App → Microsoft Sync Service → Exchange Online → Desktop / Android** appears to be failing at the **first hop** (web app → sync service). ### 5.5 **Web App Lacks Retry Logic** The web app provides: - No manual retry - No way to cancel a stuck sync - No way to reset sync session - No way to regenerate sync token Thus, when the backend stalls, the web app remains stuck indefinitely. ### 5.6 **Android Background Sync Not the Cause** Android is syncing perfectly with desktop Outlook, proving Android is not the source of the issue. ### 5.7 **Web App Sync Isolation (New Insight)** The web app is the **only** platform failing to communicate with Exchange Online. This is now clearly a **web‑app‑specific sync session failure**, not a multi‑platform issue. --- ## 6. **Impact** - Tasks frequently out of sync - Web app becomes unusable for task management - Daily workflow disrupted - Manual intervention required multiple times per week - Task state inconsistent across platforms - Reduced confidence in Microsoft To Do as a reliable ecosystem --- ## 7. **Requested Assistance** ### 7.1 **Engineering‑Level Investigation** Specifically into: - Outlook Web App sync token behavior - Web app → Exchange Online sync session stability - Backend retry logic - Web app sync error handling - Web app task API connectivity ### 7.2 **Diagnostic Tools** If available: - Sync session logs - Sync token status - Task metadata inspection tools - Backend queue visibility - Error codes beyond “Synchronization failed” ### 7.3 **Known Issues** Requesting documentation on: - Known To Do / Outlook Web sync token stalls - Known Exchange Online sync delays - Known intermittent sync failures - Known web app pipeline instability ### 7.4 **Confirmation Whether This Is a Known Issue** Given the duration and reproducibility, this appears to be a **backend‑level web app sync failure**. ### 7.5 **Request for Web App Sync Session Reset** Specifically: - Manual reset of the web app’s sync session - Forced regeneration of sync token - Flush of stuck sync queues - Verification of web app’s Exchange Online connectivity --- ## 8. **Evidence Available** I can provide: - Screenshots of “Synchronization failed” - Screenshots of “Synchronization in progress” - Timeline of sync failures - Android device logs - Browser console logs --- ## 9. **Conclusion** This is a **persistent, platform‑specific sync failure** affecting only the Outlook Web App. Desktop Outlook and Android To Do sync perfectly, proving the backend and data are healthy. The web app is isolated and failing to communicate with Exchange Online. I am requesting **engineering‑level support** to reset or repair the web app’s sync session and investigate the underlying cause. ---Solved67Views0likes1CommentGraph API 1.0 - Listing lists doesn't return all lists (todoTaskList)
Hi, first time posting here, please let me know if I should be doing something differently! I've searched throughout the internet and couldn't find a reason for this. I've got a couple of users running into a problem where the https://learn.microsoft.com/en-us/graph/api/todo-list-lists?view=graph-rest-1.0&tabs=http endpoint only returns one list (Flagged Emails), though these users have and see many other lists in the To Do desktop (macOS) app. I've confirmed in both cases it's the same user that's identified in my app/integration and in the desktop app. They can see the tasks in that list without a problem. There are no errors requesting that list, and asking via `/users/{id|userPrincipalName}/todo/lists` also returns the same response (with that one list). Is there any known situation where this could be happening? Am I missing something obvious? Is there something else I should be trying? I've got many other customers using the To Do integration without a problem. I'm aware "My Day" and a few other special lists aren't returned. Thank you so much!662Views0likes7Commentserror when sharing list
Hi all, MS support was not helpful, so hope you can support me in how to fix. My wife and I we are using private @outlook.com accounts. We are heavy users of todo and we have some shared lists between our accounts. So far all good, all fine. Now if i create a new list, no matter if in browser, ios app, .... i have to switch to another list and to switch back to see the share button. If i click it, there is the error that a problem has occured and link can't get created. Please try again. If i do so, it works and a link is created. If my wife then tries to open such link, she gets the question if she wants to access list XYZ like it should be and it always was. If she does it, there is an error "the list was not found, please contact the person who shared with you. We have the exact behaviour if she tries to share with me. The exisitng, already shared lists, are running well. Any idea or thoughts, how to overcome this issue? Greetings, DennisSolved934Views9likes22CommentsTo Do Task Details Not Showing
When I am in To Do, I can only add and complete tasks. I no longer have the option to click in and see details, add notes, or edit titles. I can see the area they are supposed to pop up in, but I can't expand the side window or see any information.122Views0likes0CommentsMy Tasks in Planner - Assigned to Me. Not Showing in Outlook ToDo Sidebar
Within the new Outlook, I leverage the functionality to drag a task from the ToDo sidebar and place it in my Calendar as a way to block time for completing that task. However, not all tasks show up in the Outlook ToDo sidebar. The category "Assigned to Me" does not show up meaning any task that was assigned to me in a plan I cannot place in my calendar. Struggling to find a uniform way to manage my tasks when there isn't complete visibility and uniformity in Microsoft's tools. And when will there be an updated mobile solution to Planner? The current outdated (and not supported) app does not include any premium plans, just basic.367Views3likes3CommentsMicrosoft To Do login issue and missing tasks across platforms
Hello, I'm currently experiencing a serious issue with the Microsoft To Do app on Android. Suddenly, it started prompting me to log in again. After logging in, it goes into an endless loading loop and keeps asking me to log in repeatedly. I tried logging out and back in, but the issue persists. I then checked the PC version of the app, and strangely, none of my To Do lists were visible. When I accessed the web version, it just says “Preparing your lists...” but nothing ever loads. Has anyone else experienced this issue or found a solution? For context, I did recently make some changes to my account’s security settings—wondering if that might be related. Thanks in advance for any help!158Views2likes1CommentUsing ToDo in new Outlook Desktop version
Hello, I would really like to use the MS To Do app in outlook, but I can't seem to find it. I have the app on my desktop. I have it online on outlook.com. (I have a PC, Windows 11) When I look on the navigation bar on the left it is not there. When I click on the square for more apps the only app that shows up is OneNote and Powerpoint. I have repaired MS 365, outlook and the ToDo app. Nothing has worked. Any suggestions would be really helpful. Georgina149Views1like0CommentsSync with Outlook Calendar
Greetings, I’m using an iPad 10th gen with Outlook for iOS. What I want to know is if its possible to sync To Do tasks that were assigned to me in My Day. I seem to do everything that I need but I cant manage to see them in my calendar. We are using this system to make a big pool of tasks that we need to do around the shops and sometimes when our regular duties are done, we could pick some tasks in the pool, assign them to the correct workers and then it would appear in their calendar so other people can see that they are already doing something in the Day. I’m sorry if its hard to understand as I’m not a native English speaker. My first language is french so dont hesitate to ask for more information if you need some. Thank you and have a good day.142Views0likes0CommentsHow do I link a ToDo list to a Chat (NOT a Team's Channel)
Hi, In a Microsoft Teams Channel, you can set up the Lists app or install the Planner app to track tasks. However, I have a chat with my boss (not a Teams Channel), and we want to track our to-dos or tasks. For some reason, I can't install the Lists or Planner app in our chat. When I click on the "+" sign at the bottom, the apps I mentioned above aren't showing up. Vipul76Views0likes0Comments