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]

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.

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

I had the same issue. I solved by going to accounts in the settings of windows on my personal laptop. There I had to add my work account for acces to other apps. From then on, it was possible again to login to Onedrive with my work account. Good luck!

Same Issue need solution quickly Microsoft

I also need to find a solution for this. I have a user in our environment with this exact same issue.

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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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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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

2024-05-08T19:22:12+00:00

I had the same issue. I solved by going to accounts in the settings of windows on my personal laptop.

There I had to add my work account for acces to other apps.

From then on, it was possible again to login to Onedrive with my work account.
Good luck!
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2 people found this answer helpful.

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Anonymous

2024-04-30T08:41:38+00:00

Same Issue need solution quickly Microsoft
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Anonymous

2024-04-29T21:50:46+00:00

I also need to find a solution for this. I have a user in our environment with this exact same issue.
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2 people found this answer helpful.

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