Chat History Not Visible for New Participant
I conducted a test where a new participant was added to an ongoing chat. The participant is successfully added to the chat but cannot see the chat history. However, the participant remains in the chat after the conversation ends. Is there a central-level setting that prevents the chat from including historical messages and always creates a new chat for added participants?
Please tell me how to disable the Pin Copilot message
Morning! I wrote a message yesterday but nobody replied, so here's another one so it doesn't get lost Can somebody tell me how to disable the annoying "Pin Copilot Chat" popup? every morning I have to say "Maybe Later" when I really mean to say NEVER IN A THOUSAND YEARSTeams build 25275.2601.4002.2815) instantly closes on launch ucrtbase.dll error 0xc0000409
After updating to Teams 25275.2601.4002.2815, the app opens for one second then closes—no UI, no error. Env: Win 11 Pro 23H2 (26100) WebView2 141.0.3537.92 Entra ID joined (AAD) Faulting module: ucrtbase.dll Exception code: 0xc0000409 Path: C:\Program Files\WindowsApps\MSTeams_25275.2601.4002.2815_x64__8wekyb3d8bbwe\ms-teams.exe Tried: cleared Teams/WebView2/AAD caches, reinstalled Teams + WebView2 + VC++, did Reset this PC and clean USB install — same result. Works fine for local admin + other Entra users and browser. Older builds (Aug/Sep 2025) work fine → likely regression in this release. Please confirm if known and being investigated.
Stealing Access Token Secrets from Teams is Hard Unless a Workstation is Compromised
Teams stores information in a local state file, including encrypted access tokens. A report from a French company explained how to extract and use those tokens with the Graph API. Is this important? It could be if attackers manage to gain access to a workstation, but at that point you’ve got other problems, and maybe using code to decrypt some tokens is the least of your troubles. https://office365itpros.com/2025/10/27/local-state-file-teams/Securing Microsoft Teams Best Practice & Cleanup
Working on a Teams environment that is fully wide open. They have seen a huge number of Teams created and are looking to get it under control from here on out and clean up. Wanted some advice on what you recommend doing and if you have the instructions to complete those tasks. My thoughts would be Block Team creation where IT would need to be involved. I believe this could be accomplished by blocking M365 Group creation. Way to expire or archive old Teams with no activity in X amount of time? Also, how are you handling guest invitations or access? Doing anything that allows but might secure things better for the organization. Thanks all.
