Users may have been unable to access sign-out button or account details across multiple Microsoft 365 web services

Title: Users may have been unable to access sign-out button or account details across multiple Microsoft 365 web services User impact: Users may have been unable to access sign-out button or account details across multiple Microsoft 365 web services. More info: Affected Microsoft 365 services on the web included but weren't limited to Outlook on the web, OneDrive web, and SharePoint Online web where users may have been unable to access the account drop-down in the top right of the web client, preventing them from accessing the sign-out button and account details in this location. Final status: We've determined that a recent service migration between infrastructure environments introduced an issue that resulted in service impact. To restore service, we've reverted the change and rolled the affected service back to the previous infrastructure. Following the rollback and continued monitoring of service telemetry, we've confirmed that service functionality has been fully restored and the issue is no longer occurring. Scope of impact: Impact was specific to some users attempting to access the sign-out button and account details in multiple Microsoft 365 services on the web. Start time: Tuesday, June 30, 2026, at 5:22 PM UTC End time: Wednesday, July 1, 2026, at 7:37 AM UTC Root cause: A recent service migration between infrastructure environments introduced an issue that resulted in service impact. Next steps: -We're reviewing our deployment processes to implement corrective measures in order to help prevent similar issues from reoccurring during future infrastructure migrations. This is the final update for the event.