Users may be seeing unexpected users when changing accounts in Microsoft 365 Copilot Chat

Title: Users may be seeing unexpected users when changing accounts in Microsoft 365 Copilot Chat User impact: Users may have seen unexpected users when changing accounts in Microsoft 365 Copilot Chat. More info: While we work to improve the long-term stability of our code change, users won't be able to use the "change account" feature. Affected users were unable to modify or access these unexpected users in any way. Final status: We've determined that our best option to ensure a comprehensive resolution is to temporarily disable the "change account feature" while we prepare a code change to ensure that this feature is only available for the expected scenarios. After we finalize our code improvements, we'll re-enable this feature. Scope of impact: Users attempting to change account in Microsoft 365 Copilot Chat may have seen unexpected users. Start time: Monday, October 5, 2026, at 11:23 AM UTC End time: Friday, October 23, 2026, at 11:18 PM UTC Root cause: A recently deployed build of Microsoft 365 Copilot Chat contained an issue that showed unexpected users when changing accounts in Microsoft 365 Copilot Chat. Next steps: - We're improving the "change account" feature to ensure that its functionality aligns with user expectations. This is the final update for the event.

Title: Users may be seeing unexpected users when changing accounts in Microsoft 365 Copilot Chat User impact: Users may be seeing unexpected users when changing accounts in Microsoft 365 Copilot Chat. More info: Affected user are unable to modify or access these unexpected users in any way. Current status: We've reviewed recent changes to Microsoft 365 Copilot Chat and identified an update that correlates with the time this issue began. We're considering our options to revert it back to a healthy build to remediate impact. Scope of impact: Users attempting to change account in Microsoft 365 Copilot Chat may see unexpected users. Root cause: A recently deployed build of Microsoft 365 Copilot Chat contains an issue that's showing unexpected users when changing accounts in Microsoft 365 Copilot Chat. Next update by: Friday, October 23, 2026, at 12:30 AM UTC