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Impacted services
Microsoft 365 suite
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Details
Title: Some users may have been unable to setup Multi-Factor Authentication (MFA) or access the mysignins.microsoft.com website
User impact: Users may have been unable to setup MFA or access the mysignins.microsoft.com website.
More info: Users may have encountered 504 Gateway Timeout errors when trying to access mysignins.microsoft.com
Current status: We've identified a recent cache configuration change required a failover. During the failover, the service experienced high CPU and memory utilization as EU traffic peaked, which prevented the MySignIn service from processing the volume of requests. Mitigation actions have since been rolled back, and traffic has been restored to the original infrastructure.
Scope of impact: Some users attempting to setup MFA or accessing the mysignins.microsoft.com website may have been impacted.
Start time: Monday, June 1, 2026, at 5:50 AM UTC
End time: Monday, June 1, 2026, at 9:50 AM UTC
Root cause: A recent cache configuration change required a failover. During the failover, the service encountered high CPU and memory utilization as peak EU traffic increased, which prevented the MySignIn service from handling the volume of requests.
Next steps:
- We're continuing to monitor the service and will complete a thorough post-incident review to help prevent similar issues in the future.
We'll provide a preliminary Post-Incident Report within two business days and a final Post-Incident Report within five business days.
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