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Microsoft 365 Services Restored After Azure Front Door Outage Triggered by Kubernetes Crashes

Microsoft attributes the disruption to capacity loss in Azure Front Door caused by crashed Kubernetes instances.

Overview

  • Microsoft reported delays and timeouts starting around 07:40 UTC, initially concentrated across Europe, the Middle East and Africa when accessing Azure and Entra portals.
  • Engineers restarted underlying Kubernetes infrastructure, rebalanced traffic, and initiated a failover for the Microsoft 365 portal to accelerate recovery.
  • Microsoft said it restored roughly 96–98% of affected Azure Front Door resources during mitigation and later confirmed full service recovery after monitoring.
  • The incident interfered with Microsoft Entra single sign-on and delivery of Multi-Factor Authentication messages, leaving some users unable to authenticate.
  • Administrators were directed to Service Health Dashboard entries MO1168665 and MO1169016 and Microsoft 365 Status updates, as outage trackers logged thousands of user reports; a separate, brief North America issue later in the day was traced to a network misconfiguration and resolved.