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
    2024-08-05T20:06:52+00:00

    Any time I submit a ticket to O365 support and they find out that we are using a Server OS, O365 support closes the ticket and tells me that 'contact Server support." So in my experience, O365 support won't assist if you are using a Server OS. And when I have contacted Server OS support, I've been told to contact O365 support. How can we actually get support for the products we pay for?

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  2. Anonymous
    2024-08-05T20:24:25+00:00

    Same goes for my ticket. Still pending with O365 support. I will check the suggestions and see if it will work on our end.

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  3. Anonymous
    2024-08-06T11:07:19+00:00

    I have tested this fix and it does appear to resolve the issue.

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  4. Anonymous
    2024-08-09T14:21:20+00:00

    I'm also seeing this in Horizon 8, instant clone desktop VDI using FSLogix HF4 for profile management. We are trying to get the New Teams and New Outlook working on Win10 Enterprise desktops. We use Okta 2fa and on a new profile we can get setup in all the apps New Teams, New Outlook, OneDrive, Edge, etc... However, once we logoff the session and get a new session, this is when we start to see the error as reported.

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  5. Anonymous
    2024-08-09T14:30:51+00:00

    JQueen.24 - Are you using a vTPM? My golden image never had a vTPM and when I created a new pool and told horizon NOT to add the vTPM my issue went away. As such that became my fix.

    Additionally on the 31st PhRust posted this and it seems to have helped others.

    We had the same problem after an upgrade to Server 2022 with FSLogix HF4 (2.9.8884.27471), after we set the "RoamIdentity" to "1" via GPO it works fine.

    https://learn.microsoft.com/en-Us/fslogix/reference-configuration-settings?tabs=profiles#roamidentity

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