Critical Copilot Chat History Missing Post-Update (Privacy Dashboard Export is Empty)

D Bartkowiak 5 Reputation points
2026-10-21T13:52:03.22+00:00

Hello, my account has experienced a severe server-side migration failure following the recent Copilot app refresh. All of my legacy chat history and pinned conversations have completely vanished.

I have already completed all standard troubleshooting: I cleared my browser cache, tested across separate devices, and signed out and back in. Furthermore, I ran a full data export from the Microsoft Privacy Dashboard under the "Copilot app activity history" section, and the downloaded CSV file is completely empty.

This is a back-end account profile link failure, not a visual app sync issue. I need a live support agent or engineering team member to look at my account-linking records and investigate the server-side migration status of my profile database container.

Microsoft Copilot | Microsoft 365 Copilot | Development
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  1. AI answer

    2026-10-21T13:53:31.9133333+00:00

    For a personal Copilot account, verify the original authentication route once, then open a Microsoft support case through Get Help and report the missing pre-migration history and empty Privacy Dashboard export.

    1. Perform the remaining identity check

    Signing out and back in does not rule out an identity mismatch if the original account used Google or Apple authentication.

    • If Copilot was originally accessed through Google or Apple: sign out, then select Continue with Google or Continue with Apple specifically. Do not merely enter the same email address through another sign-in route.
    • If multiple personal accounts may be involved:
      1. Open a private/incognito browser window.
      2. Go to copilot.microsoft.com.
      3. Sign in with each relevant original personal account.
      4. If the account remains on copilot.microsoft.com, it has not moved yet. If it redirects to copilot.com, it has moved or is completing migration.

    Microsoft states that chats and eligible content move automatically, but migration can take time; personal and work/school accounts remain separate. ^1^

    If neither condition applies, proceed directly to escalation. There is no need to repeat cache clearing, device testing, restarting, or an ordinary sign-out/sign-in.

    2. Open a live-agent support request

    Personal Microsoft account

    On a Windows PC signed in with the relevant personal Microsoft account:

    1. Open the Get Help app.
    2. Enter:
      Copilot legacy chat history and pinned conversations missing after app migration; Privacy Dashboard activity export is empty
    3. Complete the initial prompts.
    4. Select Contact Support when offered.
    5. Choose the Copilot/Microsoft account product and the closest available issue category, then select Confirm.
    6. Choose Chat with a support agent in your web browser or request a callback.

    Contact methods vary by product, scenario, subscription, and operating hours. ^2^

    If Get Help is unavailable, use Microsoft’s web customer-support flow; it can route eligible technical-support cases to chat. ^3^

    Also submit an engineering report from Copilot:

    1. Select … in the upper-right corner.
    2. Select Send feedback.
    3. Select Report a problem.
    4. Include the migration date, affected platforms, operating system, and screenshots without personal or confidential information. ^1^

    Work or school account

    Do not use the personal-account Privacy Dashboard or consumer Get Help route. Contact the organization’s Microsoft 365 administrator or service desk and ask them to open a Microsoft 365 support case for the affected tenant and user. Personal and organizational account histories are separate. ^1^

    3. Include this evidence in the case

    Paste the following:

    After the updated Copilot app migration, all legacy chats and pinned conversations disappeared across multiple devices. Browser cache clearing and a standard sign-out/sign-in did not resolve it. The Microsoft Privacy Dashboard export for Copilot app activity history produced an empty CSV. No activity was intentionally deleted.

    Original account type: [personal Microsoft / Google / Apple / work or school]
    Original sign-in method: [method]
    Approximate date and time first observed: [date, time, time zone]
    Affected clients: [web/Windows/macOS/iOS/Android]
    Redirect result from the private-session migration check: [copilot.microsoft.com or copilot.com]
    Request: investigate the account’s Copilot content-migration state and whether the pre-migration conversations remain recoverable.

    Mention that the CSV is empty and provide it privately only if support requests it. The Privacy Dashboard documentation confirms that the export should download activity history as CSV, but it does not state that an empty export proves deletion, corruption, or a particular account-link failure. ^4^

    Microsoft documents that signed-in Copilot ordinarily exposes conversation history and retains the last 18 months of interactions, but it does not publish a self-service restoration procedure for content that remains absent after migration. ^5^

    Avoid posting the CSV, account identifiers, conversation contents, or screenshots containing personal data in a public Q&A thread.

    References

    1. Troubleshoot Your Content in the Updated Copilot App | Microsoft Support
    2. Get Help for Microsoft personal account users | Microsoft Support
    3. Contact Microsoft customer support | Microsoft Support
    4. Manage your Copilot activity history in the privacy dashboard | Microsoft Support
    5. Conversation history in Microsoft Copilot
    AI-generated content may be incorrect. Read our transparency notes for more information.

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