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Microsoft 365 Outage Eases After Azure Front Door Failure Tied to Kubernetes Crash

Microsoft attributes the disruption to a Kubernetes-linked Azure Front Door capacity loss, with service largely restored.

Overview

  • Microsoft says the incident began around 07:40 UTC with delays and timeouts across Europe, the Middle East and Africa when connecting to Azure and Entra portals.
  • Engineers report recovery of roughly 96–98% of affected Azure Front Door resources, with a small subset of customers still experiencing intermittent issues.
  • The company cites crashed Kubernetes instances as the trigger for about a 30% loss of Azure Front Door capacity, predominantly in EMEA.
  • Mitigations included restarting Kubernetes infrastructure, rebalancing traffic, and initiating failover for the Microsoft 365 portal while teams monitor telemetry.
  • Impact included authentication failures for services such as Teams and Exchange, non-delivery of MFA prompts, and user-reported issues with consumer services like Minecraft and the Microsoft Store, with tens of thousands of outage reports logged on Downdetector.