Microsoft 365 Alert – Service Degradation – Microsoft Copilot (Microsoft 365) – Users may be unable to view SharePoint Online files that are linked by Copilot Chat or Copilot agents – ONGOING

30/06/2026 09:57:00 AM

NHSmail Reference: INC46865041

Microsoft Reference: CP1409288

Issue Status: ONGOING

Issue Description: Users may be unable to view SharePoint Online files that are linked by Copilot Chat or Copilot agents.

More info: When users select the link to a SharePoint Online file that has been provided by Copilot Chat or Copilot agents, they receive an error that says, “We couldn’t show the file.”

The issue may also impact links to Microsoft Word, Microsoft Excel, Microsoft PowerPoint, and PDF files.

Current Update: 01/07/2026 09:24:00 AM –Microsoft has completed the deployment and confirmed with their organisation that the affected users are now able to select the link, which opens the SharePoint Online files in a separate tab as a short-term fix. They are validating the efficacy of a long-term fix that will fully restore the functionality and open the SharePoint Online files in the same window, as expected.

Scope of impact: This issue may potentially impact any user attempting to view SharePoint Online files that are linked by Copilot Chat or Copilot agents.

Root cause: A recent change intended to improve the file preview experience for Copilot Chat is causing errors when attempting to open linked files.

Next update by: Tuesday, July 7, 2026, at 9:00 PM UTC