Some users may be intermittently unable to access Microsoft 365 Copilot Chat in Outlook on the web

Title: Some users may be intermittently unable to access Microsoft 365 Copilot Chat in Outlook on the web User impact: Users may have intermittently been unable to access Copilot Chat in Outlook on the web. More info: When some users attempted to access Copilot Chat in Outlook on the web, they may have intermittently received an error that stated, "Something went wrong. An error occurred. Please try again." Final status: Our investigation identified a misconfiguration with the Agent Builder feature, which caused users to intermittently be unable to access Copilot Chat in Outlook on the web. We disabled this configuration within the feature and confirmed with previously affected users that impact is remediated. Scope of impact: Impact was specific to some users who attempted to access Copilot Chat in Outlook on the web. Start time: Thursday, August 13, 2026, at 5:26 PM UTC End time: Saturday, August 15, 2026, at 12:30 AM UTC Root cause: A misconfiguration with the Agent Builder feature, which caused users to intermittently be unable to access Copilot Chat in Outlook on the web. Next steps: - To help prevent similar impact in the future, we're further reviewing the underlying cause of the misconfiguration. This is the final update for the event.

Title: Some users may be intermittently unable to access Microsoft 365 Copilot Chat in Outlook on the web User impact: Users may be intermittently unable to access Copilot Chat in Outlook on the web. More info: When some users attempt to access Copilot Chat in Outlook on the web, they may intermittently receive an error that states, "Something went wrong. An error occurred. Please try again." Current status: Our review of service logging to identify the source of impact and determine our next steps is ongoing. Scope of impact: Impact is specific to some users attempting to access Copilot Chat in Outlook on the web. This section may be updated as the investigation progresses. Next update by: Saturday, August 15, 2026, at 2:00 AM UTC

Title: Some users may be intermittently unable to access Microsoft 365 Copilot Chat in Outlook on the web User impact: Users may be intermittently unable to access Copilot Chat in Outlook on the web. More info: When some users attempt to access Copilot Chat in Outlook on the web, they may intermittently receive an error that states, "Something went wrong. An error occurred. Please try again." Current status: We've deployed our fix to the affected environment; however, we found that impact persists. Further review confirmed our previous root cause understanding was incorrect, and we've resumed our review of service logging to isolate the source of impact, so we can determine which mitigative actions can be implemented to restore service functionality. Scope of impact: Impact is specific to some users attempting to access Copilot Chat in Outlook on the web. This section may be updated as the investigation progresses. Root cause: An underlying client rendering issue within Copilot Studio is intermittently preventing Copilot Chat from rendering correctly in Outlook on the web. Next update by: Saturday, August 15, 2026, at 12:00 AM UTC

Title: Some users may be intermittently unable to access Microsoft 365 Copilot Chat in Outlook on the web User impact: Users may be intermittently unable to access Copilot Chat in Outlook on the web. More info: When some users attempt to access Copilot Chat in Outlook on the web, they may intermittently receive an error that states, "Something went wrong. An error occurred. Please try again." Current status: We’ve deployed the fix to a subset of the affected environments and are preparing to begin deployment to the remaining affected environments. Once available, we’ll provide a deployment completion timeline. Scope of impact: Impact is specific to some users attempting to access Copilot Chat in Outlook on the web. This section may be updated as the investigation progresses. Root cause: An underlying client rendering issue within Copilot Studio is intermittently preventing Copilot Chat from rendering correctly in Outlook on the web. Next update by: Friday, August 14, 2026, at 10:00 PM UTC

Title: Some users may be intermittently unable to access Microsoft 365 Copilot Chat in Outlook on the web User impact: Users may be intermittently unable to access Copilot Chat in Outlook on the web. More info: When some users attempt to access Copilot Chat in Outlook on the web, they may intermittently receive an error that states, "Something went wrong. An error occurred. Please try again." Current status: We've completed validation of the fix and have started deploying it to the affected environments. As deployment progresses, we're monitoring service telemetry and error rates to verify that Copilot Chat is loading successfully for affected users. We expect deployment to complete before our next scheduled update. Scope of impact: Impact is specific to some users attempting to access Copilot Chat in Outlook on the web. Root cause: An underlying client rendering issue within Copilot Studio is intermittently preventing Copilot Chat from rendering correctly in Outlook on the web. Next update by: Friday, August 14, 2026, at 5:00 PM UTC

Title: Some users may be intermittently unable to access Microsoft 365 Copilot Chat in Outlook on the web User impact: Users may be intermittently unable to access Copilot Chat in Outlook on the web. More info: When some users attempt to access Copilot Chat in Outlook on the web, they may intermittently receive an error that states, "Something went wrong. An error occurred. Please try again." Current status: We've identified that additional validations of the fix are required prior to deploying the fix to the affected environments. We expect the validations will be complete and we'll aim to provide a resolution timeline by our next scheduled update. Scope of impact: some users attempting to access Copilot Chat in Outlook on the web may be affected. This information may be updated as our investigation continues. Root cause: An underlying client rendering issue within Copilot Studio is causing intermittent impact Copilot Chat in Outlook on the web. Next update by: Friday, August 14, 2026, at 9:30 AM UTC

Title: Some users intermittently can't access Microsoft 365 Copilot Chat in Outlook on the web User impact: Users intermittently can't access Copilot Chat in Outlook on the web. More info: When some users attempt to access Copilot Chat in Outlook on the web, they intermittently receive an error that states, "Something went wrong. An error occurred. Please try again." Current status: After further review, we identified an underlying client rendering issue that's causing the intermittent impact. We've developed a fix for the issue and are preparing for its application to the affected environment. We'll provide available updates on the deployment timeline at the next scheduled update time. Scope of impact: Your organization is impacted by this event, and some users attempting to access Copilot Chat in Outlook on the web are affected. This information may be updated as our investigation continues. Root cause: An underlying client rendering issue within Copilot Studio is causing intermittent impact Copilot Chat in Outlook on the web. Next update by: Friday, August 14, 2026, at 6:00 AM UTC

Title: Some users intermittently can't access Microsoft 365 Copilot Chat in Outlook on the web User impact: Users intermittently can't access Copilot Chat in Outlook on the web. More info: When some users attempt to access Copilot Chat in Outlook on the web, they intermittently receive an error that states, "Something went wrong. An error occurred. Please try again." Current status: We identified some recent changes to authentication components and we're evaluating whether those changes are contributing to the impact. If the changes are causing impact, we'll determine if they can be rolled back safely. Scope of impact: Your organization is impacted by this event, and some users attempting to access Copilot Chat in Outlook on the web are affected. This information may be updated as our investigation continues. Next update by: Friday, August 14, 2026, at 1:30 AM UTC

Title: Some users intermittently can't access Microsoft 365 Copilot Chat in Outlook on the web User impact: Users intermittently can't access Copilot Chat in Outlook on the web. More info: When some users attempt to access Copilot Chat in Outlook on the web, they intermittently receive an error that states, "Something went wrong. An error occurred. Please try again." Current status: We're reviewing our service side logs to identify any failures or abnormalities that may indicate the source of the impact. Scope of impact: Your organization is impacted by this event, and some users attempting to access Copilot Chat in Outlook on the web are affected. This information may be updated as our investigation continues. Next update by: Thursday, August 13, 2026, at 11:30 PM UTC

Title: Some users intermittently can't access Microsoft 365 Copilot Chat in Outlook on the web User impact: Users intermittently can't access Copilot Chat in Outlook on the web. More info: When some users attempt to access Copilot Chat in Outlook on the web, they intermittently receive an error that states, "Something went wrong. An error occurred. Please try again." Current status: We're reviewing the sample screenshots and errors provided by your organization to gain clarity on the issue and determine the next steps to isolate the root cause. Scope of impact: Your organization is impacted by this event, and some users attempting to access Copilot Chat in Outlook on the web are affected. This information may be updated as our investigation continues. Next update by: Thursday, August 13, 2026, at 9:30 PM UTC

Title: We're looking into a potential problem impacting Microsoft 365 Copilot Chat User impact: We're checking for potential impact to your users. Current status: We're investigating a potential issue impacting Copilot and checking for impact to your organization. We'll provide an update within 30 minutes.