I can't sign in in desktop apps

Mariam Elsayed Abdelmonim Ahmed Darwish 0 Reputation points
2026-10-28T07:40:25.4466667+00:00

I have been unable to sign in to my university Microsoft account ([Moderator note: Personally Identifiable Information removed] @qu.edu.qa]) in the desktop versions of PowerPoint, Outlook, OneDrive, and other Microsoft Office applications for approximately four months.

My account works correctly in a web browser, but the desktop apps show “An unexpected error occurred.”

Error details

Tag: 7ita9

Code: 3399811147

Correlation ID: [Moderator note: Personally Identifiable Information removed]

Timestamp: 2026-10-27T19:17:04.000Z

I have tried clearing the relevant saved OneDrive credential, re-registering the Windows Microsoft sign-in components through PowerShell, restarting the laptop, and testing a different internet connection. The issue persists.

Could you please investigate whether this is related to my university account's desktop-app authentication, licensing, or Windows authentication configuration?

Thank you for your assistance.

Microsoft 365 and Office | OneDrive | For education | Windows
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  1. Doris V 2,760 Reputation points Microsoft External Staff Moderator
    2026-10-28T09:28:59.24+00:00

    Hello Mariam,

    Thank you for contacting the Microsoft Community.

    I understand that you have been unable to sign in to your university Microsoft account in Outlook, PowerPoint, OneDrive, and other Microsoft 365 desktop applications for approximately four months. Since your account works in a web browser, but the desktop applications display "An unexpected error occurred," let's try the following steps to refresh your saved credentials and authentication data.

    1/Remove Microsoft 365 credentials from Windows Credential Manager

    1. Close all Microsoft 365 applications, including OneDrive.
    2. Open Control Panel and select Credential Manager.
    3. Select Windows Credentials.
    4. Look for entries related to Microsoft 365, Office, Outlook, OneDrive, or your university account.
    5. Remove the relevant entries.

    2/Clear the Microsoft 365 authentication cache

    1. Close all Microsoft 365 applications and OneDrive.
    2. Press Windows + R, enter %localappdata%\Microsoft, and press Enter.
    3. Locate the OneAuth and IdentityCache folders.
    4. Rename them to OneAuth.old and IdentityCache.old, respectively, if the folders exist.

    3/Disconnect and reconnect your work or school account

    1. Open Settings > Accounts > Access work or school.
    2. Select your university account and click Disconnect, if available.

    4/Reset the Office registry configuration

    A corrupted user-level Office registry configuration may contribute to sign-in problems. Incorrect registry changes can cause issues, so back up the relevant key before proceeding.

    1. Close all Office applications.
    2. Search for Registry Editor in the Start menu and open it.
    3. Navigate to: Computer\HKEY_CURRENT_USER\Software\Microsoft\Office
    4. Right-click the Office folder and select Export to back it up.
    5. Right-click the folder again and select Rename.
    6. Rename it to Office.Old.
    7. Close Registry Editor, open Word, and try signing in again.
    8. Restart your computer and try signing in again.

    Note: This resets user-level Office registry settings and may affect customizations or application preferences. If necessary, restore the original configuration from your exported backup.

    If the issue persists, follow Microsoft's official troubleshooting guide to reset the Microsoft 365 Apps activation state. The guide explains how to use the available troubleshooting tools to refresh the activation state. Reference: Reset activation state for Microsoft 365 Apps for enterprise

    After completing these steps, please let us know whether you can sign in successfully or whether the same error persists.

    Kind regards

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  2. AI answer

    2026-10-28T07:41:30.45+00:00

    Disconnect and reconnect the university account under Windows Access work or school, which resets the device registration used across Outlook, OneDrive, PowerPoint, and the other Microsoft 365 desktop apps for this exact 7ita9/3399811147 sign-in pattern.^1^

    Reconnect the Windows account

    Disconnecting may temporarily remove access to university-managed resources on this PC. If the device is owned or managed by the university, ask its IT team before proceeding.

    1. Close every Microsoft 365 application, including Outlook and OneDrive.
    2. Open Settings → Accounts → Access work or school.
    3. Select the university account, then select Disconnect.
    4. Restart Windows after the disconnection. This restart is part of rebuilding the registration, rather than repeating the standalone restart already attempted.
    5. Return to Settings → Accounts → Access work or school → Connect.
    6. Sign in with the university account.
    7. Open one Office application and sign in, then test OneDrive and Outlook.

    Because clearing the OneDrive credential and re-registering Windows sign-in components did not help, do not repeat those operations at this stage.

    If reconnection does not resolve it

    Run the supported Microsoft 365 sign-in diagnostic:

    1. Open the Windows Get Help app.
    2. Search for sign in to Microsoft Office.
    3. Complete the Microsoft 365 sign-in troubleshooter and record its findings.^2^

    Microsoft also documents the Support and Recovery Assistant for diagnosing common non-browser Office sign-in failures.^3^

    Have the university administrator correlate the failure

    The error code alone does not establish whether the failure is caused by licensing, Conditional Access, or the Windows authentication broker. Provide university IT with the displayed:

    • Timestamp, including UTC
    • Correlation ID
    • Affected username
    • Application used for the attempt

    An administrator with at least the Reports Reader role should:

    1. Open Microsoft Entra admin center → Entra ID → Monitoring & health → Sign-in logs.
    2. Filter by Correlation ID and the matching date/time.
    3. Open the failed event and review:
      • Failure reason and sign-in error code
      • Authentication Details
      • Device Info
      • Conditional Access
      • Troubleshooting and support

    These logs identify the actual tenant-side failure and any policy that interrupted the desktop sign-in.^4^

    • If the event shows a Conditional Access failure, IT must address the named policy or device requirement.
    • If the event shows an account or authentication failure, IT must correct that tenant-side condition.
    • If no corresponding failed event appears, give IT the Get Help results and request investigation of the Windows client registration/authentication path.

    Check licensing separately

    A license problem should be verified rather than inferred from 7ita9. To inspect the local Microsoft 365 activation state, open Windows PowerShell and run:

    cd "$env:ProgramFiles\Microsoft Office\Office16"
.\vnextdiag.ps1 -action list

    For 32-bit Office on 64-bit Windows, use:

    cd "${env:ProgramFiles(x86)}\Microsoft Office\Office16"
.\vnextdiag.ps1 -action list

    The output shows the installed product, activation user, tenant, license type, and whether its state is Licensed.^5^

    If it is not licensed, university IT must verify that the account has a Microsoft 365 plan containing desktop applications. Do not reset activation unless the diagnostic or administrator confirms an activation-state problem.

    References

    1. Correlation Id: [Moderator note: personal information removed] Timestamp: 2025-11-26T13:17:04.000Z DPTI: [Moderator note: personal information removed] Message: An unexpected error occurred. Tag: 7ita9 Code: 3399811147 - Microsoft Q&A
    2. Access work or school troubleshooter for restoring access to M365 desktop applications | Microsoft Support
    3. How to troubleshoot non-browser apps that can't sign in to Microsoft 365, Azure, or Intune | Microsoft Support
    4. Troubleshoot sign-in problems with Conditional Access
    5. Check the license and activation status for Microsoft 365 Apps
    AI-generated content may be incorrect. Read our transparency notes for more information.

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