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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 365 Copilot Chat CW1530649

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

Status
Service degradation
Feature
General
Region
Not specified (all regions)
Started
Sep 1, 2026, 05:38 CEST
Duration
58 days 18 h
Last update
Oct 29, 2026, 20:09 CET
Next update
Nov 4, 2026, 17:30 CET

Current status

We've identified a recent feature update that introduced an error which is resulting in impact. We've deployed a code fix to address the error and remediate the impact. We're monitoring the rollout of the fix deployment, and the current timeline estimates it will be completed by our next scheduled communication update.

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 Chat. This information may be updated as our investigation continues.

Root cause

A recent feature update revealed an error resulting in this impacting event.

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To see whether your own tenant is affected, check Service health in the Microsoft 365 admin center. Only a backup outside Microsoft protects against data loss, and only a tested break-glass account against locked-out admins. We set up both in fixed-scope sprints.

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.