TM1403917: Microsoft Teams Service Health Incident (Service Degradation)

[365 Service Alert]

Some users may not see chat messages from new contacts in the Microsoft Teams desktop client until a restart occurs.                                                                                                                                                                                        

Some users may not see chat messages from new contacts in the Microsoft Teams desktop client until a restart occurs ID: TM1403917 Issue type: Incident Status Service Degradation Impacted services Microsoft Teams Details Title: Some users may not see chat messages from new contacts in the Microsoft Teams desktop client until a restart occurs User impact: Users may not have seen chat messages from new contacts in the Microsoft Teams desktop client until a restart occured. More info: Feedback from affected users and internal testing indicated the impact may have been specific to the combined chat and channel view in the Microsoft Teams desktop client. Impacted users may have been able to avoid impact by utilizing the desktop client's separated chat and channel view experience. Final status: We've identified some missing local settings in the Microsoft Teams desktop client and a feature that allows users to move chats to a new section was relying on these missing settings, causing impact. While we continue to investigate the reason the local settings were going missing so we can develop a long-term code fix, we disabled the offending feature and confirmed that impact is remediated. Scope of impact: Some users that were recipients of messages from new contacts in the Microsoft Teams desktop client may have been impacted. Start time: Friday, May 22, 2026, at 3:28 AM UTC End time: Friday, June 26, 2026, at 1:25 AM UTC Root cause: Some missing local settings in the Microsoft Teams desktop client and a feature that allowed users to move chats to a new section was relying on these missing settings caused impact. Next steps: - We're continuing to investigate the reason the local settings are going missing, so we can develop a long-term code fix. This is the final update for the event. Is this message helpful? Did you find this email helpful? Yes No To customize what’s included in this email, who gets it, or to unsubscribe, set your Service health preferences. If you are receiving this email because your Admin added you as a recipient, please contact your Admin to unsubscribe. Privacy Statement Microsoft Corporation, One Microsoft Way, ​Redmond, WA 98052​