Users are unable to submit a prompt in Microsoft 365 Copilot Chat and receive an error message

A post-incident report has been published.

A post-incident report has been published.

Title: Users are unable to submit a prompt in Microsoft 365 Copilot Chat and receive an error message User impact: Users are unable to submit a prompt in Microsoft 365 Copilot Chat and receive an error message. More info: Microsoft 365 Copilot Chat returned the following error message: "Something went wrong." Some users were unable to submit a prompt in Microsoft 365 Copilot Chat and received an error message. Some users saw Copilot responses being provided successfully at first but then encountered an error message that overridden and removed the response after it had initially been generated successfully. Final status: We have confirmed with impacted users that the issue has been fully resolved. We appreciate your organization's understanding and patience while we worked on addressing this incident. Scope of impact: This issue affected some users when they tried to submit a prompt in Microsoft 365 Copilot Chat. This section was updated as our investigation continued. Start time: Friday, June 12, 2026, at 4:00 AM UTC End time: Monday, June 15, 2026, at 10:40 PM UTC Root cause: A recently deployed service change in Microsoft 365 Copilot Chat introduced an issue in the request processing path. The change caused an extension, that was expected to run prior to the final response generation, to instead run after the response had already been fully generated. As this post-generation execution path was not expected, the extension incorrectly modified the completed response state. This caused otherwise successful chat responses to be treated as failed requests by the processing path, resulting in affected users seeing a "Something went wrong" message instead of the response that had originally been generated. Existing monitoring did not detect this scenario because the responses were created and stored successfully before the later error occurred. We mitigated the issue by disabling the affected code path, which restored normal service behavior. Next steps: - For a more comprehensive list of next steps and actions, please refer to the Post Incident Report document.

Title: Users are unable to submit a prompt in Microsoft 365 Copilot Chat and receive an error message User impact: Users are unable to submit a prompt in Microsoft 365 Copilot Chat and receive an error message. More info: Microsoft 365 Copilot Chat returns the following error message "Something went wrong." Some users are unable to submit a prompt in Microsoft 365 Copilot Chat and receive an error message. Some users may see Copilot responses being provided successfully at first but then see an error message that overrides and removes the response after it is initially generated successfully. Current status: We've identified that a recent change within the service was causing impact. We've deployed a configuration change to disable the offending portion of code, and we're observing positive improvements in service availability. We're currently monitoring the service and reaching out to affected users to confirm that the issue is fully resolved. Scope of impact: This issue may affect some users when trying to submit a prompt in Microsoft 365 Copilot Chat. This section may be updated as our investigation continues. Start time: Friday, June 12, 2026, at 4:00 AM UTC Root cause: A recently deployed build was identified to be causing impact, and our investigation into the root cause within this build remains ongoing. The previously outlined token authorization configuration change was not directly related to the root cause for this issue. Next update by: Tuesday, June 16, 2026, at 12:00 AM UTC

Title: Users are unable to submit a prompt in Microsoft 365 Copilot Chat and receive an error message User impact: Users are unable to submit a prompt in Microsoft 365 Copilot Chat and receive an error message. More info: Microsoft 365 Copilot Chat returns the following error message "Something went wrong." Some users are unable to submit a prompt in Microsoft 365 Copilot Chat and receive an error message. Some users may see Copilot responses being provided successfully at first but then see an error message that overrides and removes the response after it is initially generated successfully. Current status: We’ve encountered an issue within our deployment pipeline that’s preventing a roll back to the last healthy build. We’re working to unblock the pipeline with urgency and once completed, we’ll proceed with the roll back across all impacted infrastructure to the last known healthy build. We understand how much issues like this can affect your organization, and we appreciate your partnership as we work to remediate impact. Scope of impact: This issue may affect some users when trying to submit a prompt in Microsoft 365 Copilot Chat. This section may be updated as our investigation continues. Start time: Friday, June 12, 2026, at 4:00 AM UTC Root cause: A recently deployed build was identified to be causing impact, and our investigation into the root cause within this build remains ongoing. The previously outlined token authorization configuration change was not directly related to the root cause for this issue. Next update by: Monday, June 15, 2026, at 11:00 PM UTC

Title: Users are unable to submit a prompt in Microsoft 365 Copilot Chat and receive an error message User impact: Users are unable to submit a prompt in Microsoft 365 Copilot Chat and receive an error message. More info: Microsoft 365 Copilot Chat returns the following error message "Something went wrong." Some users are unable to submit a prompt in Microsoft 365 Copilot Chat and receive an error message. Some users may see Copilot responses being provided successfully at first but then see an error message that overrides and removes the response after it is initially generated successfully. Current status: Our investigation has identified a specific internal telemetry log matching the reports of this issue, beginning around Friday, June 12, 2026, at 4:00 AM UTC. From this, we’ve identified an internal service build that is causing the issue. We’re rolling back to the last known good build on a small portion of infrastructure to confirm the issue is resolved. Once validated, we’ll proceed with the rollback across all impacted infrastructure. Scope of impact: This issue may affect some users when trying to submit a prompt in Microsoft 365 Copilot Chat. This section may be updated as our investigation continues. Start time: Friday, June 12, 2026, at 4:00 AM UTC Root cause: A recently deployed build was identified to be causing impact, and our investigation into the root cause within this build remains ongoing. The previously outlined token authorization configuration change was not directly related to the root cause for this issue. Next update by: Monday, June 15, 2026, at 9:00 PM UTC

Title: Users are unable to submit a prompt in Microsoft 365 Copilot Chat and receive an error message User impact: Users are unable to submit a prompt in Microsoft 365 Copilot Chat and receive an error message. More info: Microsoft 365 Copilot Chat returns the following error message "Something went wrong." Some users are unable to submit a prompt in Microsoft 365 Copilot Chat and receive an error message. Some users may see Copilot responses being provided successfully at first but then see an error message that overrides and removes the response after it is initially generated successfully. Current status: We’re continuing to see failures in error logs provided by customers and internal service logs after the change reversion. While our review of the fresh set of error logs and our internal service health signals is ongoing, we’ll open more workstreams to mitigate the remaining impact based on our findings. Scope of impact: This issue may affect some users when trying to submit a prompt in Microsoft 365 Copilot Chat. This section may be updated as our investigation continues. Root cause: A recent token authorization configuration change was applied that introduced a misconfiguration to the app id, resulting in impact. Next update by: Monday, June 15, 2026, at 7:00 PM UTC

After reverting the change across the Production environment, we're still seeing some evidence of user impact through our service health telemetry systems. Some customers have also reported the issue appears to still be occurring. We’re investigating a fresh set of logs to determine our next steps to resolve the issue. This quick update is designed to give the latest information on this issue.

Title: Users are unable to submit a prompt in Microsoft 365 Copilot Chat and receive an error message User impact: Users are unable to submit a prompt in Microsoft 365 Copilot Chat and receive an error message. More info: Microsoft 365 Copilot Chat returns the following error message "Something went wrong." for users when they submit a prompt. Current status: We’ve successfully reverted the change within the Production environment, and we’re working to confirm if this has resolved the issue, or if additional actions are required to mitigate impact. We will continue to open and pursue additional mitigation workstreams until the issue is fully resolved. Scope of impact: This issue may affect some users when trying to submit a prompt in Microsoft 365 Copilot Chat. This section may be updated as our investigation continues. Root cause: A recent token authorization configuration change was applied that introduced a misconfiguration to the app id, resulting in impact. Next update by: Monday, June 15, 2026, at 5:00 PM UTC

We've successfully reverted the change broadly across the Production environment, and we're seeing positive signs of recovery in our service telemetry. Affected customers are testing to confirm mitigation as well. This quick update is designed to give the latest information on this issue.

Title: Users are unable to submit a prompt in Microsoft 365 Copilot Chat and receive an error message User impact: Users are unable to submit a prompt in Microsoft 365 Copilot Chat and receive an error message. More info: Microsoft 365 Copilot Chat returns the following error message "Something went wrong." for users when they submit a prompt. Current status: We’ve encountered an issue with reverting the change causing it to take longer than we expected. We’ve successfully reverted the change within our internal test environment and are in the process of validating its effectiveness. When this is complete, we will revert the change more broadly. Scope of impact: This issue may affect some users when trying to submit a prompt in Microsoft 365 Copilot Chat. This section may be updated as our investigation continues. Root cause: A recent token authorization configuration change was applied that introduced a misconfiguration to the app id, resulting in impact. Next update by: Monday, June 15, 2026, at 3:00 PM UTC

Title: Users are unable to submit a prompt in Microsoft 365 Copilot Chat and receive an error message User impact: Users are unable to submit a prompt in Microsoft 365 Copilot Chat and receive an error message. More info: Microsoft 365 Copilot Chat returns the following error message "Something went wrong." for users when they submit a prompt. Current status: We’re continuing to monitor the progress of reverting the change which we expect to be complete within one hour. Scope of impact: This issue may affect some users when trying to submit a prompt in Microsoft 365 Copilot Chat. This section may be updated as our investigation continues. Root cause: A recent token authorization configuration change was applied that introduced a misconfiguration to the app id, resulting in impact. Next update by: Monday, June 15, 2026, at 2:00 PM UTC

We're closely monitoring the reversion of the change which is progressing as expected. While this continues, we're monitoring service telemetry for signs of improvement. Next update by: Monday, June 15, 2026, at 1:00 PM UTC This quick update is designed to give the latest information on this issue.

Title: Users are unable to submit a prompt in Microsoft 365 Copilot Chat and receive an error message User impact: Users are unable to submit a prompt in Microsoft 365 Copilot Chat and receive an error message. More info: Microsoft 365 Copilot Chat returns the following error message "Something went wrong." for users when they submit a prompt. Current status: We’ve identified a recent token authorization configuration change was applied that unexpectedly introduced a misconfiguration and caused impact. We're continuing to work on reverting this change. Scope of impact: This issue may affect some users when trying to submit a prompt in Microsoft 365 Copilot Chat. This section may be updated as our investigation continues. Root cause: A recent token authorization configuration change was applied that introduced a misconfiguration to the app id, resulting in impact. Next update by: Monday, June 15, 2026, at 1:00 PM UTC

Title: Users are unable to submit a prompt in Microsoft 365 Copilot Chat and receive an error message User impact: Users are unable to submit a prompt in Microsoft 365 Copilot Chat and receive an error message. More info: Microsoft 365 Copilot Chat returns the following error message "Something went wrong." for users when they submit a prompt. Current status: While we’re continuing to analyze this change, we’ve started to reverse it to mitigate the impact. When this has completed, we will begin to validate service telemetry to ensure it has fully resolved the issue. Scope of impact: This issue may affect some users when trying to submit a prompt in Microsoft 365 Copilot Chat. This section may be updated as our investigation continues. Next update by: Monday, June 15, 2026, at 12:00 PM UTC

We’ve identified a recent change that may have resulted in impact and we’re analyzing this change in more detail to determine if it is the root cause. Next update by: Monday, June 15, 2026, at 11:00 AM UTC This quick update is designed to give the latest information on this issue.

Title: Users are unable to submit a prompt in Microsoft 365 Copilot Chat and receive an error message User impact: Users are unable to submit a prompt in Microsoft 365 Copilot Chat and receive an error message. More info: Microsoft 365 Copilot Chat returns the following error message "Something went wrong." for users when they submit a prompt. Current status: While we continue to analyze the newly obtained HTTP Archive format (HAR) logs, we’ve identified a specific failure from service side telemetry and are looking into this further to determine the next steps required. Scope of impact: This issue may affect some users when trying to submit a prompt in Microsoft 365 Copilot Chat. This section may be updated as our investigation continues. Next update by: Monday, June 15, 2026, at 11:00 AM UTC

Our analysis of HTTP Archive format (HAR) logs has so far been inconclusive. We’re reviewing newly obtained logs to assist in progressing the investigation. Next update by: Monday, June 15, 2026, at 10:00 AM UTC This quick update is designed to give the latest information on this issue.

Title: Users are unable to submit a prompt in Microsoft 365 Copilot Chat and receive an error message User impact: Users are unable to submit a prompt in Microsoft 365 Copilot Chat and receive an error message. More info: Microsoft 365 Copilot Chat returns the following error message "Something went wrong." for users when they submit a prompt. Current status: Our analysis is continuing into impacted users logs and recent changes that align with the impact start time to help identify the next troubleshooting steps required to resolve the issue. While this continues, we’ve requested additional HTTP Archive format (HAR) files to assist in our investigation. Scope of impact: Your organization is impacted by this event, and users are unable to submit a prompt in Microsoft 365 Copilot Chat and receive an error message. This section may be updated as our investigation continues. Next update by: Monday, June 15, 2026, at 10:00 AM UTC

In addition to our analysis of service telemetry and client-side logs from impacted users, we’re reviewing recent changes which may have resulted in impact. Next update by: Monday, June 15, 2026, at 9:00 AM UTC This quick update is designed to give the latest information on this issue.

We're continuing our analysis of HTTP Archive format (HAR) files and service telemetry. In addition, we're attempting to reproduce the issue internally to determine the next steps required to resolve the issue. Next update by: Monday, June 15, 2026, at 9:00 AM UTC This quick update is designed to give the latest information on this issue.

Title: Users are unable to submit a prompt in Microsoft 365 Copilot Chat and receive an error message User impact: Users are unable to submit a prompt in Microsoft 365 Copilot Chat and receive an error message. More info: Microsoft 365 Copilot Chat returns the following error message "Something went wrong." for users when they submit a prompt. Current status: We're reviewing the provided case details and HTTP Archive format (HAR) files to help inform our next troubleshooting steps for pinpointing the underlying cause of the error message. Scope of impact: Your organization is impacted by this event, and users are unable to submit a prompt in Microsoft 365 Copilot Chat and receive an error message. This section may be updated as our investigation continues. Next update by: Monday, June 15, 2026, at 9:00 AM UTC

Title: Users are unable to submit a prompt in Microsoft 365 Copilot Chat and receive an error message User impact: Users are unable to submit a prompt in Microsoft 365 Copilot Chat and receive an error message. Current status: We're investigating a potential issue impacting Microsoft 365 Copilot Chat and checking for impact to your organization. We'll provide an update within 30 minutes.