Microsoft 365 Alert – Service Degradation – SharePoint Online – Users may be unable to access Excel files through browser from SharePoint Online – ONGOING

Announcements Arpan Das

11/06/2026 09:45:00 AM

NHSmail Reference: INC46848758

Microsoft Reference: SP1386381

Issue Status: ONGOING

Issue Description: Users may be unable to access Excel files through browser from SharePoint Online.

More info: As a workaround, users can open the file in the Excel desktop app instead.

Current Update: 11/06/2026 09:46:00 AM – Microsoft identified a code issue that is causing errors when opening Excel files. They are developing a fix for the issue and anticipate that it will take time to complete. Once the fix is ready, they will begin deploying to the affected environment to remediate the impact.

Scope of impact: Users accessing subsites with unique permissions not inherited from the parent site on SharePoint Online aren’t able to access files in Excel for the web browser.

Root cause: A code issue during the request flow for opening Excel files in SharePoint Online is causing errors.

Next update by: Wednesday, June 17, 2026, at 2:00 AM UTC