Microsoft 365 Alert – Service Degradation – Microsoft Teams – Some users may get stuck in a crash loop upon startup of the Microsoft Teams service – RESOLVED

Announcements Shagufta Naaz

06/05/2026 08:42:00 AM

NHSmail Reference: INC46818037

Microsoft Reference: TM1301921

Issue Status: RESOLVED

Issue Description: Some users may get stuck in a crash loop upon startup of the Microsoft Teams service.

Final Update: 06/05/2026 08:48:00 AM– 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.

Scope of impact: Microsoft are analyzing the code issue within the service update to identify necessary repairs prior to its redeployment, and they are reviewing our service update testing and validation procedures to prevent similar issues from occurring during future releases.

Root cause: Outsised loads on service infrastructure from increased traffic and ongoing improvements is causing search latency issues and resulting in impact.

They will provide a preliminary post-incident report in two business days, and a full post-incident report in five business days.