Some users may experience degradation with Microsoft 365 Copilot Chat responses after uploading a file

Title: Some users may experience degradation with Microsoft 365 Copilot Chat responses after uploading a file User impact: Users may have experienced degradation with Copilot Chat responses after uploading a file. More info: Affected users may have been returned an error message stating, "Oops! Something happened. Can you try again?" Users reported low-quality or inaccurate responses when Copilot Chat was prompted to respond on content within uploaded files. Additionally, users who attempted to send a message with file grounding may have received the following response, "I tried to open your file {file name}, but I’m currently unable to retrieve its contents due to an access/activity limit on the file." Final status: We've completed the scale-out of our configuration change to prevent retries from adding more load during OneDrive or SharePoint Online file uploads. After a period of monitoring for file upload traffic across affected regions, we've confirmed that our actions successfully remediated impact. Scope of impact: Some users may have experienced degradation with Copilot Chat responses after uploading a file. Start time: Tuesday, June 9, 2026, at 6:00 AM UTC End time: Thursday, June 11, 2026, at 6:10 PM UTC Root cause: Normal growth in Microsoft 365 Copilot Chat usage exceeded the available resources needed to process OneDrive and SharePoint Online file upload requests, causing some requests to process slower or fail. Next steps: - We're continuing to monitor previously affected traffic to confirm what additional performance optimizations we can implement to further improve the resiliency of our service to prevent similar impact scenarios from occurring in the future.

Title: Some users may experience degradation with Microsoft 365 Copilot Chat responses after uploading a file User impact: 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. Additionally, users attempting to send a message with file grounding may receive the following response, "I tried to open your file {file name}, but I’m currently unable to retrieve its contents due to an access/activity limit on the file." Current status: We've identified another facet of the impacted user experience in that users sending messages with file grounding may receive a response noting Copilot Chat can't retrieve contents due to an access or activity limit, and we've updated the More info section of this communication with this information. Our previously communicated status remains accurate, as we monitor file upload traffic across affected regions to confirm our changes are remediating the impact and scale out our configuration change to prevent retries from adding more load during OneDrive or SharePoint Online file uploads. 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. Start time: Tuesday, June 09, 2026, at 6:00 AM UTC Root cause: 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 11:00 PM UTC

Title: Some users may experience degradation with Microsoft 365 Copilot Chat responses after uploading a file User impact: 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 status: We've added additional resources to regions that were experiencing high demand, and we're monitoring file upload traffic over the next 12-14 hours across affected regions to confirm if our changes are assisting with remediation. Simultaneously, we’re also scaling out a configuration change to prevent retries from adding more load during OneDrive or SharePoint Online file uploads to additional affected regions to assist with our remediation efforts. 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. Start time: Tuesday, June 09, 2026, at 6:00 AM UTC Root cause: 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 11:00 PM UTC

Title: Some users may experience degradation with Microsoft 365 Copilot Chat responses after uploading a file User impact: 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 status: We’re adding resources in regions that were experiencing high demand and gradually allowing more file upload traffic to resume. We’re also implementing a configuration change to prevent retries from adding more load during OneDrive or SharePoint Online file uploads. We’ll 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. Start time: Tuesday, June 09, 2026, at 6:00 AM UTC 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

Title: Some users may experience degradation with Microsoft 365 Copilot Chat responses after uploading a file User impact: 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 responses or hallucinations when Copilot Chat is prompted to respond on content within uploaded files. Current status: We're implementing a configuration change to prevent indefinite retries from occurring during OneDrive or SharePoint Online file uploads along with implementing performance optimizations on affected service infrastructure to assist with processing the requests. 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. Start time: Tuesday, June 09, 2026, at 6:00 AM UTC Next update by: Thursday, June 11, 2026, at 1:00 AM UTC

Title: Some users may experience degradation with Microsoft 365 Copilot Chat responses after uploading a file User impact: 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 responses or hallucinations when Copilot Chat is prompted to respond on content within uploaded files. Current status: After analyzing service telemetry for file upload scenarios for Copilot Chat, we've isolated that unexpected increased request volume is causing our retry logic for Microsoft OneDrive and SharePoint Online file uploads to retry indefinitely, causing degradation in Copilot Chat responses. We're working to isolate the source of the increased traffic to validate the root cause of impact and to determine our next remediation actions. 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. Next update by: Wednesday, June 10, 2026, at 8:30 PM UTC

Title: Some users may experience degradation with Microsoft 365 Copilot Chat responses after uploading a file User impact: 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 responses or hallucinations when Copilot Chat is prompted to respond on content within uploaded files. Current status: We're analyzing service telemetry for file upload scenarios for Copilot Chat to isolate when the degradation started and to determine our next troubleshooting steps. 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. Next update by: Wednesday, June 10, 2026, at 6:30 PM UTC