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]

This did not work. In fact, now users cannot sign in at all.

This registry key: HKLM\SOFTWARE\Policies\Microsoft\Windows\WorkplaceJoin "BlockAADWorkplaceJoin"=dword:00000001 does not seem to have anything to do with the error "CAA90049."

Hi Everyone, Has anyone found a solution? I have the concern on some users under a Citrix environment with CPM configured. thank you for your help !

Any information on this reg key?

Once we disabled workplace join via the regkey it stopped immediately.

Error code CAA90049 - Any M365 App

Anonymous

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]

Locked Question. This question was migrated from the Microsoft Support Community. You can vote on whether it's helpful, but you can't add comments or replies or follow the question.

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67 answers

Anonymous

2024-09-17T21:47:17+00:00

This did not work. In fact, now users cannot sign in at all.
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Anonymous

2024-09-17T21:02:22+00:00

This registry key:

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

does not seem to have anything to do with the error "CAA90049."
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Anonymous

2024-09-17T02:11:15+00:00

Hi Everyone,

Has anyone found a solution?

I have the concern on some users under a Citrix environment with CPM configured.

thank you for your help !
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Anonymous

2024-09-11T21:23:54+00:00

Any information on this reg key?
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Anonymous

2024-09-04T16:30:52+00:00

Once we disabled workplace join via the regkey it stopped immediately.
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