TM1200517: Microsoft Teams Service Health Incident (Service Restored)

[365 Service Alert]

Users are seeing Microsoft Teams messaging delays and problems with other service functions.                                                                                                                                                                                                                

Users are seeing Microsoft Teams messaging delays and problems with other service functions ID: TM1200517 Issue type: Incident Status Service Restored Impacted services Microsoft Teams Details Title: Users are seeing Microsoft Teams messaging delays and problems with other service functions User impact: Users may have seen Microsoft Teams messaging delays and problems with other service functions. More info: Users may have seen delays with the following actions within any Microsoft Teams client: - Loading, creating, and editing chats and channels. - Sending and editing messages. - Loading images in chats and channels. - Initiating and transferring calls. - Viewing call history. Final status: We've clarified the affected scenarios and enumerated them in the more info section above. We've continued to observe persistent recovery without any manual intervention required, and we've received confirmation from some previously affected users that this issue is no longer occurring. Scope of impact: Any users served through an affected portion of Microsoft Teams service infrastructure may have seen delays completing the actions identified in the more info section of this communication. Start time: Friday, December 19, 2025, at 7:03 PM UTC End time: Friday, December 19, 2025, at 7:16 PM UTC Preliminary root cause: A portion of Microsoft Teams infrastructure became imbalanced and wasn't processing traffic as efficiently as expected. Next steps: - We're continuing a concerted analysis of the affected infrastructure to identify any trending traffic processing issues necessitating refinement so we can avoid a reoccurrence of this issue. We’ll provide a preliminary Post-Incident Report within two business days and a final Post-Incident Report within five business days. 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​