Summary of impact: Between 00:11 UTC and 02:25 UTC on 16 Dec 2021, customers may have experienced issues signing into Azure services.
Preliminary root Cause: A shared component of the Microsoft account (MSA) and Azure AD sign-in services stopped responding when a combination of a configuration error and a routine update caused multiple redundant endpoints to become unreachable. This caused sign-in failures in Microsoft services for both Microsoft personal accounts and Azure AD accounts.
Mitigation: Microsoft performed a failover for authentication services to redundant, healthy infrastructure.
Microsoft analyzes performance data and trends on the affected systems to ensure that mitigation remains in full effect. A Post Incident Report will be published within the next 48-72 hours. Please refer https://status.azure.com/en-us/status/history/ for the report.
Posted Dec 16, 2021 - 15:17 UTC
Update
We are continuing to monitor for any further issues.
Posted Dec 16, 2021 - 05:50 UTC
Monitoring
Microsoft performed a failover for authentication services to redundant, healthy infrastructure to mitigate the issue.
Preliminary root Cause: A shared component of the Microsoft account (MSA) and Azure AD sign-in services stopped responding when a combination of a configuration error and a routine update caused multiple redundant endpoints to become unreachable. This caused sign-in failures in Microsoft services for both Microsoft personal accounts and Azure AD accounts.
Next steps: Microsoft is analyzing performance data and trends on the affected systems to ensure that mitigation remains in full effect. A Post Incident Report will be published within the next 48-72 hours.
Posted Dec 16, 2021 - 04:28 UTC
Identified
Impact Statement: Starting at 12:11 UTC on Dec 16 2021, customers using Azure Active Directory or Microsoft account may experience authentication issues when attempting to access Azure, Dynamics 365, and/or Microsoft 365.
Current Status: Microsoft is aware of this issue and is actively investigating. The next update will be provided in 60 minutes, or as events warrant. Please refer to https://status.azure.com/en-us/status.
This message was last updated at 02:30 UTC on 16 December 2021.
Please note the time in Microsoft's notification above might be incorrect.