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Some users may be unable to load chat history or previously pinned chats, and can't pin chats in Microsoft 365 Copilot

Microsoft Copilot (Microsoft 365) CP1527498

Users may be unable to load chat history or previously pinned chats, and can't pin chats in Copilot.

Status
Service degradation
Feature
General
Region
Not specified (all regions)
Started
Oct 27, 2026, 16:58 CET
Duration
3 h 53 min
Last update
Oct 27, 2026, 19:40 CET
Next update
Oct 28, 2026, 20:30 CET

Current status

We've identified that a recent feature update revealed the error that is causing this impact. As previously communicated, there is a fix already being deployed. We're working to deploy this at a more expediated pace to remediate impact. We anticipate having a better deployment schedule at our next communication time.

More info

Previously pinned chats don't show up for users to select, and chat histories aren't showing up as expected.

Scope of impact

Some users may be unable to load chat history, previously pinned chats, and can't pin chats in Copilot. This information may be updated as our investigation continues.

Root cause

We've identified that a recent feature update revealed an error resulting in this impacting event.

Timeline

Every update Microsoft posted for this issue, newest first.

  1. Oct 27, 2026, 19:40 CET

    We've identified that a recent feature update revealed the error that is causing this impact. As previously communicated, there is a fix already being deployed. We're working to deploy this at a more expediated pace to remediate impact. We anticipate having a better deployment schedule at our next communication time.

  2. Oct 27, 2026, 18:26 CET

    We've identified that this is a potentially known issue and that there is already a fix in progress. We're reviewing ways to expediate this fix to help remediate as quickly as possible.

  3. Oct 27, 2026, 17:31 CET

    We're reviewing the information provided in specific support cases to better understand the issue and determine our next steps for troubleshooting.

  4. Oct 27, 2026, 17:05 CET

    We're investigating a potential issue impacting Microsoft 365 Copilot and checking for impact to your organization. We'll provide an update within 30 minutes.

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Source: Microsoft Graph, Service Communications API. This is the view of a Swiss Microsoft 365 tenant: services not licensed there are missing, and individual issues may affect your tenant differently. Microsoft names the region only in the issue text. The Switzerland view shows issues for Switzerland, for Europe in general and those without a region, but not issues that only name other countries such as Germany or the UK. This page is not provided by Microsoft.