Some users may get stuck in a crash loop upon startup of the Microsoft Teams service
ID: TM1301921
Issue type: Incident
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Impacted services
Microsoft Teams
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Details
Title: Some users may get stuck in a crash loop upon startup of the Microsoft Teams service
User impact: Users may have been stuck in a crash loop upon startup of the Microsoft Teams service.
Final status: After completing the reversion of the change and monitoring to ensure the corresponding service monitors have returned to the expected reliability levels, we've validated that the impact is no longer occurring.
Scope of impact: Some users attempting to start the Microsoft Teams service may have been stuck in a crash loop.
Start time: Wednesday, May 06, 2026, at 12:05 AM UTC
End time: Wednesday, May 06, 2026, at 6:30 AM UTC
Root cause: A recent standard service update contained a code issue which led to a client build validation failure and caused users' clients to attempt to relaunch repeatedly.
Next steps: We're closely analyzing the code issue within the service update to identify necessary repairs prior to its redeployment, and we're reviewing our service update testing and validation procedures to prevent similar issues from occurring during future releases.
We’ll provide a preliminary post-incident report in two business days, and a full post-incident report in five business days.
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