Admins intermittently may be unable to access the Microsoft 365 admin center

Title: Admins intermittently may be unable to access the Microsoft 365 admin center User impact: Admins intermittently may have been unable to access the Microsoft 365 admin center. Final status: We've rolled back our infrastructure to a previous build and changed the response behavior of the API to mitigate the surge of requests and resolve the issue. We've also turned off a recently introduced service change and reduced dropped calls to help stabilize the traffic to the admin center. Scope of impact: Admins attempting to access the Microsoft 365 admin center may have been intermittently affected. Start time: Monday, October 5, 2026, at 10:28 PM UTC End time: Tuesday, October 6, 2026, at 6:16 AM UTC Root cause: An unexpected influx in requests caused performance degradation and failures for admins who attempted to access the Microsoft 365 admin center. Next steps: - We're continuing to monitor the affected infrastructure closely to gain further insight into the source of the performance degradation caused by the unexpected influx of requests and better prevent similar impact in the future.

Title: Admins intermittently may be unable to access the Microsoft 365 admin center User impact: Admins intermittently may be unable to access the Microsoft 365 admin center. Current status: We've received additional reports that impact persists despite a previous communication indicating impact remediation. We're reviewing our service health telemetry and logs to help assist our investigation into why impact still persists. Scope of impact: Admins attempting to access the Microsoft 365 admin center may be intermittently affected. This section may be updated as our investigation continues. Root cause: An unexpected influx in requests caused performance degradation and failures for admins attempting to access the Microsoft 365 admin center.