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

Announcements Arpan Das

11/06/2026 10:08:00 AM

NHSmail Reference: INC46848796

Microsoft Reference: CW1386443

Issue Status: ONGOING

Issue Description: Users may experience degradation with Copilot Chat 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 or inaccurate responses when Copilot Chat is prompted to respond on content within uploaded files.

Current Update: 11/06/2026 10:08:00 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 Chat 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