Error code CAA90049 - Any M365 App

Anonymous
2024-04-08T18:25:48+00:00

Hello, I have a remote end user that is receiving this error code when trying to sign into any M365 app. Once we close the error message the apps work perfectly fine but this happens daily when signing on and I would like to find a permanent fix. I would attach a screenshot but that doesn't seem to be working right now.

  • User enters login credentials and Microsoft authenticator code then this error pops up for any m365 app / teams / OneDrive.
  • User is in another state so can't come into office.

Something went wrong

We couldn't sign you in. If this error persists, contact your system administrators and provide the error code CAA90049.

Error code: CAA90049

Correlation ID: 9a55***1d07

Server message: Session key is empty

Any help is appreciated.

Thank you

[PII is removed by moderator]

Microsoft 365 and Office | Subscription, account, billing | For business | Other

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  1. Anonymous
    2024-12-17T21:46:51+00:00

    Thanks for this, after running this command it fixed the issue.

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  2. Anonymous
    2024-09-18T19:09:58+00:00

    UPDATE:

    The registry key:

    HKLM\SOFTWARE\Policies\Microsoft\Windows\WorkplaceJoin
    "BlockAADWorkplaceJoin"=dword:00000001

    Does seem to be working. I had to reboot the servers a couple of times before I actually saw a change.

    I will keep monitoring and report back with issue.

    Thank you cf34!

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  3. Anonymous
    2024-09-17T11:47:39+00:00

    https://learn.microsoft.com/en-us/answers/questions/792235/windows-10-pop-up-message-to-allow-my-organization

    HKLM\SOFTWARE\Policies\Microsoft\Windows\WorkplaceJoin
    "BlockAADWorkplaceJoin"=dword:00000001

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  4. Anonymous
    2024-06-26T03:59:05+00:00

    Has anybody found a fix for this issue? We've been running with this issue for months using VMWare Horizon VDI

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  5. Anonymous
    2024-04-11T10:37:50+00:00

    Dear Smeets2001,

    Since our forum is dedicated to Microsoft 365 Business features troubleshooting, your issue seems related to log in issue in Azure AD SSO, to ensure you get professional help, we recommend that you re-post this issue in Microsoft Entra - Microsoft Q&A. Members there are more knowledgeable on these kinds of concerns and they will further help you investigate the issue.

    Thank you for your patience and understanding.

    Sincerely,

    Aurora | Microsoft Community Moderator

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