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]

Run wsreset.exe from command prompt.

This issue can occur on first login. So the first time a user signs into Windows/Office, a user gets this error. Nothing to "clear" then as the profile is brand new. Seen this issue in Windows 10 too. Not just VDI for us.

Actually i might have found a solution. sign out from every Microsoft app and close them delete your own certificates in the internet properties (content -> certificates) delete every office/teams or microsoft related credentials in the "windows credentials" in the credential manager in the control panel if you had any smartcard related certificates reseat your connected smartcard so the certificates can load again. Sign into any microsoft app

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

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

2024-07-11T23:12:56+00:00

This does not work.
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Anonymous

2024-07-10T12:28:31+00:00

Run wsreset.exe from command prompt.
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Anonymous

2024-06-26T11:19:14+00:00

This issue can occur on first login. So the first time a user signs into Windows/Office, a user gets this error. Nothing to "clear" then as the profile is brand new. Seen this issue in Windows 10 too. Not just VDI for us.
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Anonymous

2024-06-26T08:23:22+00:00

Actually i might have found a solution.

sign out from every Microsoft app and close them

delete your own certificates in the internet properties (content -> certificates)

delete every office/teams or microsoft related credentials in the "windows credentials" in the credential manager in the control panel

if you had any smartcard related certificates reseat your connected smartcard so the certificates can load again.

Sign into any microsoft app
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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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1 person found this answer helpful.

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