SP1461217: SharePoint Online Service Health Incident (Service Restored)

[365 Service Alert]

Guest users are unable to access SharePoint Online sites connected to Microsoft Teams.                                                                                                                                                                                                                      

Guest users are unable to access SharePoint Online sites connected to Microsoft Teams ID: SP1461217 Issue type: Incident Status Service Restored Impacted services SharePoint Online Details Title: Guest users were unable to access SharePoint Online sites connected to Microsoft Teams User impact: Guest users were unable to access SharePoint Online sites connected to Microsoft Teams. More info: Specifically, guest users were redirected to an AccessDenied.aspx page when attempting to access SharePoint Online sites where access is granted through Microsoft 365 Groups. As a potential workaround, admins could have manually add affected guest users directly to the SharePoint Members group instead of relying on Microsoft 365 Group membership propagation. Final status: We've completed a period of monitoring service telemetry, and we've observed the restoration of service availability to normal levels. Additionally, during this time, we've received multiple reports from previously affected customers that they're experiencing relief from impact, and as such, we've determined this incident is resolved. Scope of impact: This issue could have impacted any guest users attempting to access SharePoint Online sites where access is granted through Microsoft 365 Groups. Start time: Thursday, August 20, 2026, at 7:30 AM UTC End time: Tuesday, August 25, 2026, at 3:54 PM UTC Preliminary root cause: A recently deployed change interacted with dynamic claims process, causing impact. Next steps: - We're conducting a review of our internal change management processes to ensure the appropriate controls are in place and to reduce the likelihood of similar issues occurring in the future. We'll provide a preliminary Post-Incident Report within two business days and a final Post-Incident Report within five business days. Is this message helpful? Did you find this email helpful? Yes No To customize what’s included in this email, who gets it, or to unsubscribe, set your Service health preferences. If you are receiving this email because your Admin added you as a recipient, please contact your Admin to unsubscribe. Privacy Statement Microsoft Corporation, One Microsoft Way, ​Redmond, WA 98052​