Microsoft 365 Alert – Service Degradation – Microsoft Copilot (Microsoft 365) – Users may experience degradation with Copilot responses after uploading a file – ONGOING

Announcements Arpan Das

11/06/2026 09:58:00 AM

NHSmail Reference: INC46848795

Microsoft Reference: CP1386444

Issue Status: ONGOING

Issue Description: Users may experience degradation with Copilot responses after uploading a file.

More info: Affected users may be returned an error message stating, “Oops! Something happened. Can you try again?”

Users report low-quality responses or hallucinations when Copilot is prompted to respond on content within uploaded files.

Current Update: 11/06/2026 10:00:00 AM – Microsoft are adding resources in regions that were experiencing high demand and gradually allowing more file upload traffic to resume. They are also implementing a configuration change to prevent retries from adding more load during OneDrive or SharePoint Online file uploads. They will monitor the affected environment during peak usage periods to confirm whether the added resources are sufficient to fully mitigate impact.

Scope of impact: Some users may experience degradation with Copilot responses after uploading a file. This section may be updated as the investigation progresses.

Root cause: We’ve determined that normal growth in Microsoft 365 Copilot usage exceeded the available resources needed to process OneDrive and SharePoint Online file upload requests, causing some requests to process slower or fail.

Next update by: Thursday, June 11, 2026, at 5:00 PM UTC