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]

Disconnect the MS account in windows settings under “access school or work”. Then open Teams or Outlook and sign in again.

We are encountering this issue as well in a VDI environment.

Same here, did yo manage to fix it?

Office/Teams seem to work just fine after we click "Continue." Of course, our Help Desk is flooded with calls about this error prompt. So we would like a resolution - shouldn't receive this prompt at all. We are running Server 2022.

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]

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67 answers

Anonymous

2024-05-28T21:28:23+00:00

Disconnect the MS account in windows settings under “access school or work”.

Then open Teams or Outlook and sign in again.
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Anonymous

2024-06-12T20:05:07+00:00

We are encountering this issue as well in a VDI environment.
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Anonymous

2024-06-12T21:18:46+00:00

Same here.
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Anonymous

2024-06-12T21:19:05+00:00

Same here, did yo manage to fix it?
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Anonymous

2024-06-12T21:27:04+00:00

Office/Teams seem to work just fine after we click "Continue." Of course, our Help Desk is flooded with calls about this error prompt. So we would like a resolution - shouldn't receive this prompt at all. We are running Server 2022.
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3 people found this answer helpful.

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