Microsoft Admin Center

User impact: Admins may not been able to view SHD and Message Center posts in the Microsoft 365 admin center operated by 21Vianet.   Final Status: After a period of monitoring, we confirmed that the impacted infrastructure self-restored, and service returned to expected performance levels. We closely monitored the service to ensure that it remained healthy.   Scope of impact: Any admin might have been impacted and might not have been able to view SHD and Message Center posts in the Microsoft 365 admin center operated by 21Vianet. This section could have been updated as the investigation continued.   Start time: Sunday, June 21, 2026, at 8:03 AM UTC   End time: Tuesday, June 23, 2026, at 7:17 AM UTC   Root cause: A portion of the infrastructure performed suboptimally, resulting in impact.   Next steps: - We're analyzing performance data and trends on the affected infrastructure to help prevent this problem from happening again.   This is the final update for the event.