Users are reporting access issues for Office 365.

Users may be unable to access multiple Microsoft 365 services. Existing sessions do not appear to be affected. Affected users are encouraged to keep existing sessions going and to avoid re-authenticating to Microsoft 365 services. Any Microsoft 365 service that leverages Azure Active Directory (AAD) authentication may be impacted by this issue.

Updated status: Microsoft has identified and is reverting a recent change to the service which may be causing or contributing to the impact. Some services are already coming back online.