Microsoft 365 Alert – Service Degradation – Exchange Online – Admins may have been unable to complete migrations from third-party services to Microsoft Teams – RESOLVED

15/09/2025 09:00:00 AM

NHSmail Reference: INC46628965

Microsoft Reference: TM1152560

Issue Status: RESOLVED

Issue Description: Admins may have been unable to complete migrations from third-party services to Microsoft Teams.

Final Update: 15/09/2025 09:03:00 AM – Microsoft have completed deployment of their fix to the affected environment. They have validated with a subset of affected admins that they’re now able to complete migrations from third-party services to Microsoft Teams as expected.

Root cause: A recent service update contained a code defect which was causing channel migration requests to fail even though the request says it’s successful, resulting in impact.

Scope of impact: Any admin attempting to complete user migrations from third-party services to Microsoft Teams may have been impacted.

Next Steps: Microsoft are reviewing the offending service update to validate why the potential for impact wasn’t caught during our update validation and testing phases. This analysis will help us to improve the rigor of our update validation process and ensure similar impact doesn’t occur in future.