Users may have experienced access issues when using one or more Microsoft 365 services. Specifically SharePoint Online and Microsoft Teams users in Europe; though, users may have also experienced similar issues with Exchange Online, OneDrive for Business.

Impact was primarily to users located in the United Kingdom; however, users in other regions who were routed through the affected United Kingdom-based infrastructure may have also been impacted.

Start time: Tuesday, January 12, 2021, 3:51 PM (3:51 PM UTC)

End time: Tuesday, January 12, 2021, 4:40 PM (4:40 PM UTC)

Preliminary root cause: Processing infrastructure that handles Microsoft 365 request traffic for European users began experiencing failures, preventing some users from accessing the services.