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How can i fix the error message that reads "The credential is invalid. Unexpected sub status"?

Anonymous
2025-04-09T17:27:30+00:00

How to fix "The credential is invalid. Unexpected sub status." in Outlook? I have attempted reseting my password with no success and logging in on the app and browser version and the error keeps showing up.

Message: Error message "The credential is invalid. Unexpected sub status (6008).

Tag: 657rx

Code: 2148073494

Outlook | Windows | New Outlook for Windows | For home

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  1. Anonymous
    2025-04-14T22:27:55+00:00

    Dear customer,

    Good day! Thank you for posting to Microsoft Community. We are happy to help you.

    For this issue: The credential is invalid. Unexpected sub status (6008).

    Common Solutions

    1. Clear Cached Credentials

    ++Open Control Panel.

    ++Go to User Accounts > Credential Manager.

    ++Remove any entries related to your email account under Windows Credentials or Generic Credentials.

    ++Restart Outlook and try adding the account again.

    1. Registry Fix (Windows Only)

    ++Open regedit.

    ++Navigate to HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Common\Identity.

    ++Create a DWORD EnableADAL and set it to 0 (disable ADAL) or 1 (force-enable).

    ++Restart Outlook.

    1. Verify Account Type and Settings

    ++Verify if the account uses multi-factor authentication (MFA).

    ++Check if there are any security policies affecting authentication in the new Outlook.

    Best regards,

    Serena - MSFT | Microsoft Community Support Specialist

    1 person found this answer helpful.
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