Admins may not be able to search for Microsoft 365 Copilot Chat messages using Microsoft Purview eDiscovery searches

Title: Admins may not be able to search for Microsoft 365 Copilot Chat messages using Microsoft Purview eDiscovery searches User impact: Admins may not have been able to search for Copilot Chat messages using eDiscovery searches. Final status: We've confirmed that the fix has fully saturated and impact is now fully remediated. Scope of impact: Admins performing eDiscovery searches that should've contained Copilot Chat messages may have been impacted by this event. Start time: Friday, February 13, 2026, at 7:20 PM UTC End time: Friday, March 27, 2026, at 12:00 AM UTC Root cause: A latent code error was preventing some metadata from being indexed as expected, which was resulting in impact. Next steps: - We're further analyzing the indexing error to better understand how this wasn't detected sooner and what changes we can make to our monitoring and testing to help prevent similar issues in the future. This is the final update for the event.

Title: Admins may not be able to search for Microsoft 365 Copilot Chat messages using Microsoft Purview eDiscovery searches User impact: Admins may not be able to search for Copilot Chat messages using eDiscovery searches. Current status: Based on the current rate of saturation from our fix deployment, we anticipate it will complete, remediating impact for all admins, by our next scheduled communication update on Friday, March 27, 2026, at 1:30 AM UTC. Scope of impact: Admins performing eDiscovery searches that should contain Copilot Chat messages may be impacted by this event. Start time: Friday, February 13, 2026, at 7:20 PM UTC Estimated time to resolve: We anticipate the deployment of our fix will complete by Friday, March 27, 2026, at 1:30 AM UTC. Root cause: A latent code error is preventing some metadata from being indexed as expected, which is resulting in impact. Next update by: Friday, March 27, 2026, at 1:30 AM UTC

Title: Admins may not be able to search for Microsoft 365 Copilot Chat messages using Microsoft Purview eDiscovery searches User impact: Admins may not be able to search for Copilot Chat messages using eDiscovery searches. Current status: We've validated the fix in the remaining environments and initiated its release. We're monitoring as it progresses and will provide a remediation timeline once one is available. Scope of impact: Admins performing eDiscovery searches that should contain Copilot Chat messages may be impacted by this event. Start time: Friday, February 13, 2026, at 7:20 PM UTC Root cause: A latent code error is preventing some metadata from being indexed as expected, which is resulting in impact. Next update by: Thursday, March 26, 2026, at 8:00 PM UTC

Title: Admins may not be able to search for Microsoft 365 Copilot Chat messages using Microsoft Purview eDiscovery searches User impact: Admins may not be able to search for Copilot Chat messages using eDiscovery searches. Current status: We've deployed our fix to a majority of affected users, who should start to see relief from this issue. We're proceeding with a meticulous deployment of this fix to the remaining affected users and once completed will be testing with a subset of users within this environment to ensure remediation. Scope of impact: Admins performing eDiscovery searches that should contain Copilot Chat messages may be impacted by this event. Root cause: A latent code error is preventing some metadata from being indexed as expected, which is resulting in impact. Next update by: Wednesday, March 25, 2026, at 8:00 PM UTC

Title: Admins may not be able to search for Microsoft 365 Copilot Chat messages using Microsoft Purview eDiscovery searches User impact: Admins may not be able to search for Copilot Chat messages using eDiscovery searches. Current status: We've developed and deployed a fix to a subset of affected users, who should start to see relief of this issue as it saturates. We intend to proceed with a meticulous deployment of this fix to the remaining affected users on Monday, March 23, 2026. We'll provide updates to the full remediation timeline as soon as they become available. Scope of impact: Admins performing eDiscovery searches that should contain Copilot Chat messages may be impacted by this event. Root cause: A latent code error is preventing some metadata from being indexed as expected, which is resulting in impact. Next update by: Monday, March 23, 2026, at 8:00 PM UTC

Title: Admins may not be able to search for Microsoft 365 Copilot Chat messages using Microsoft Purview eDiscovery searches User impact: Admins may not be able to search for Copilot Chat messages using eDiscovery searches. Current status: Our investigation has confirmed that a latent code error is preventing some metadata from being indexed as expected, resulting in impact. We've developed a fix and are in the process of safely releasing the change to remediate impact. We expect the fix will be fully released by the next scheduled update. Scope of impact: Admins performing eDiscovery searches that should contain Copilot Chat messages may be impacted by this event. Root cause: A latent code error is preventing some metadata from being indexed as expected, which is resulting in impact. Next update by: Friday, March 20, 2026, at 9:00 PM UTC

Title: Admins may not be able to search for Microsoft 365 Copilot Chat messages using Microsoft Purview eDiscovery searches User impact: Admins may not be able to search for Copilot Chat messages using eDiscovery searches. Current status: We're progressing with our analysis into the isolated parsing failures as we determine the source for this event. In parallel, we're further reviewing an internal setting adjustment to determine if it may be viable for addressing the eDiscovery search problems admins are experiencing when searching for some Copilot Chat. Scope of impact: Admins performing eDiscovery searches that should contain Copilot Chat messages may be impacted by this event. Next update by: Friday, March 13, 2026, at 5:30 PM UTC

Title: Admins may not be able to search for Microsoft 365 Copilot Chat messages using Microsoft Purview eDiscovery searches User impact: Admins may not be able to search for Copilot Chat messages using eDiscovery searches. Current status: After using the data generated by our reproduction to review the indexing model, we've found that some necessary data from the Copilot Chat messages isn't being parsed, resulting in some messages being unavailable during the search. We're continuing to investigate these parsing failures to isolate their source and determine our next troubleshooting steps. Scope of impact: Admins performing eDiscovery searches that should contain Copilot Chat messages may be impacted by this event. Next update by: Tuesday, March 10, 2026, at 5:30 PM UTC

Title: Admins may not be able to search for Microsoft 365 Copilot Chat messages using Microsoft Purview eDiscovery searches User impact: Admins may not be able to search for Copilot Chat messages using eDiscovery searches. Current status: We're using data generated by our reproduction of the impact through our internal testing environment to investigate the indexing model for the conversation history in the portion of storage infrastructure responsible for storing Copilot Chat messages, which will help us pinpoint the source of the indexing issue. Scope of impact: Admins performing eDiscovery searches that should contain Copilot Chat messages may be impacted by this event. Next update by: Monday, March 9, 2026, at 8:00 PM UTC

Title: Admins may not be able to search for Microsoft 365 Copilot Chat messages using Microsoft Purview eDiscovery searches User impact: Admins may not be able to search for Copilot Chat messages using eDiscovery searches. Current status: Our initial review of the Copilot Chat messages that aren't appearing in the eDiscovery searches suggest that their indexes aren't matching the associated keywords. We're using our internal testing environment to troubleshoot and gain further understanding on what issue is occurring with the indexes. Scope of impact: Admins performing eDiscovery searches that should contain Copilot Chat messages may be impacted by this event. Next update by: Friday, March 6, 2026, at 9:30 PM UTC

Title: Admins may not be able to search for Microsoft 365 Copilot Chat messages using Microsoft Purview eDiscovery searches User impact: Admins may not be able to search for Copilot Chat messages using eDiscovery searches. Current status: We're reviewing the explanation of the scenario provided by a subset of impacted users so that we can gain clarity on the issue and determine the next steps to isolate the root cause. Scope of impact: Admins performing eDiscovery searches that should contain Copilot Chat messages may be impacted by this event. Next update by: Friday, March 6, 2026, at 6:30 PM UTC

Title: Admins may not be able to search for Microsoft 365 Copilot Chat messages using Microsoft Purview eDiscovery searches User impact: Admins may not be able to search for Copilot Chat messages using eDiscovery searches. Current status: We're investigating a potential issue impacting Microsoft 365 Copilot Chat and checking for impact. We'll provide an update within 30 minutes.