Some users may have been unable to setup Multi-Factor Authentication (MFA) or access the mysignins.microsoft.com website

A post-incident report has been published.

A post-incident report has been published.

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 Final 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 7:10 AM UTC End time: Monday, June 1, 2026, at 9:50 AM UTC Root cause: A recent configuration change within the Redis cache layer required a failover before it could be fully applied to the production environment. When that failover occurred, it coincided with peak traffic levels in Europe, which increased demand on the remaining MySignIn service infrastructure. Under this elevated load, the service experienced high Central Processing Unit (CPU) and memory utilization and was unable to process requests at the expected rate. As a result, some users encountered 504 Gateway Timeout errors when attempting to set up Multi-Factor Authentication (MFA) or access mysignins.microsoft.com. Next steps: - For a more comprehensive list of next steps and actions, please refer to the Post Incident Report document.

Title: Some users may be unable to setup Multi-Factor Authentication (MFA) or access the mysignins.microsoft.com website User impact: Users may be unable to setup MFA or access the mysignins.microsoft.com website. More info: Users may encounter 504 Gateway Timeout errors when trying to access mysignins.microsoft.com Current status: We've completed mitigation actions, including failing over to alternate infrastructure, and are continuing to monitor service health. As elevated error rates persist, we're actively evaluating additional mitigation options, including optimizing how service requests are processed to further stabilize the service. Scope of impact: Some users attempting to setup MFA or accessing the mysignins.microsoft.com website may be impacted. Next update by: Monday, June 1, 2026, at 12:00 PM UTC

We’ve completed the failover and while we initially observed improvement, we’re continuing to see elevated error rates. We’re actively implementing additional mitigation actions to stabilize the service as we continue our investigation into a potential underlying cache-related issue. This quick update is designed to provide the latest information on this issue. Next update by: Monday, June 1, 2026, at 11:00 AM UTC

We’ve completed a failover to healthy infrastructure and are closely monitoring service telemetry to confirm recovery. In parallel, we’re continuing to investigate the underlying cache-related issues that may be contributing to impact. This quick update is designed to give the latest information on this issue.

Upon an initial review of service telemetry, we've identified cache failures as a potential root cause for impact, and we're continuing to investigate this further to verify this theory. In parallel, we're conducting a failover to healthy infrastructure in an attempt to provide relief. This quick update is designed to give the latest information on this issue.

Title: Some users may be unable to setup Multi-Factor Authentication (MFA) or access the mysignins.microsoft.com website User impact: Users may be unable to setup MFA or access the mysignins.microsoft.com website. More info: Users may encounter 504 Gateway Timeout errors when trying to access mysignins.microsoft.com Current status: We're continuing to analyze service health telemetry to isolate the root cause and determine any additional troubleshooting steps, and potential mitigation actions. Scope of impact: Some users attempting to setup MFA or accessing the mysignins.microsoft.com website may be impacted. Next update by: Monday, June 01, 2026, at 11:00 AM UTC

Title: Some users may be unable to setup Multi-Factor Authentication (MFA) or access the mysignins.microsoft.com website User impact: Users may be unable to setup MFA or access the mysignins.microsoft.com website. Current status: We've received reports indicating an issue with setting up MFA or accessing the mysignins.microsoft.com page. We're reviewing service health telemetry to help isolate the root cause and determine our next troubleshooting steps. Scope of impact: Some users attempting to setup MFA or accessing the mysignins.microsoft.com website may be impacted. Next update by: Monday, June 01, 2026, at 11:00 AM UTC