Microsoft Copilot: Chat history disappeared after update – “Chats and content couldn’t finish syncing”

TH 35 Reputation points
2026-09-08T21:55:15.1633333+00:00

After today’s Microsoft Copilot app update, all of my previous Copilot conversations disappeared from one of my Microsoft accounts.

The issue occurs across multiple devices and platforms:

  • Acer Aspire 3 – Copilot app
  • Tablet – Copilot app
  • Copilot on the web

The same devices were tested with another Microsoft account, and that account still has its complete conversation history. This suggests that the issue is specific to the affected Microsoft account rather than to a particular device or installation.

There is also a specific synchronization error. When I sign out and sign back in to the affected account, Copilot displays:

“Chats and content couldn't finish syncing. Try again to continue bringing over your chats and content.”

I have already tried signing out and signing back in several times and checked the account on multiple devices and on the web. The result is the same.

My main question is: Is there a way to recover the missing conversations or complete the failed synchronization/migration of the previous chat history?

The missing conversations contain important information, so I would particularly like to know whether the conversations may still be stored on Microsoft's side even though they are currently not visible in Copilot.

Any guidance would be greatly appreciated.

Microsoft Copilot | Windows Copilot | App

8 answers

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  1. Iris 0 Reputation points
    2026-09-10T02:49:27.9066667+00:00

    Time is 10:45 edt - my chat history is reappearing. I did open a ticket with microsoft privacy yesterday as directed to by microsoft support yesterday afternoon. Check your chats and see if anything is coming back. Many (besides all of you) were experiencing the issues. I am also seeing the message at top of my copilot:

    "Chats and content are syncing

    They'll begin appearing shortly. This may take some time, you can keep using Copilot in the meantime."

    as opposed to yesterdays sync error.

    Good luck to all of us!

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  2. T A 0 Reputation points
    2026-09-09T17:42:47.3166667+00:00

    Same problem here. All my previous chat sessions are gone after yesterday update. Both desktop application and web application. Very sad.

    Seems like a sync problem

    Screenshot 2026-09-09 103423

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  3. RebeccaClarke-7111 0 Reputation points
    2026-09-09T18:13:12.9633333+00:00

    I have the same issue. My chats have disappeared since the update with a notification about trouble syncing chats and content.

    The chats still exist in the csv I exported, so they're not gone. Just not accessible from the front end.

    https://support.microsoft.com/en-us/privacy/manage-your-copilot-activity-history-in-the-privacy-dashboard

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