UserHasNoMailboxAndNoLicenseAssignedError

Hi @Boopathi S ,

Thanks for helping me.
AmbientAuthenticationInPrivateModesEnabled value is changed from 1 to 0 under HKEY_LOCAL_MACHINE\ Software\Policies\Microsoft\Edge which fixed the issue

Great to know that you've already thought of a solution and really appreciate it for your sharing!
By the way, since the Microsoft Q&A community has a policy that "The question author cannot accept their own answer. They can only accept answers by others.". and according to the scenario introduced here: Answering your own questions on Microsoft Q&A, I would make a brief summary of this thread:
[UserHasNoMailboxAndNoLicenseAssignedError]

Issue Symptom:

The mailbox has a license assigned and can successfully sign in to Chrome on the same computer.
And logged in on another computer very well.
Uninstalled EDGE and installed
Then mail works in OWA
But it does not work in InPrivate EDGE Mode. It gives the below message.
Client Id: C9B2F3E32B2D4BA8AE7A4835BE8508DD
Session Id: fbf1f235-0a08-4547-a07e-4d6127c68587
Client Version: 20221028006.04
BootResult: configuration
err: Microsoft.Exchange.Clients.Owa2.Server.Core.OwaUserHasNoMailboxAndNoLicenseAssignedException
esrc: StartupData
et: ServerError
estack: Error: 500
at f (https://outlook.office365.com/mail/:10:267321)
at https://outlook.office365.com/mail/:10:275782
st: 500
ehk: X-OWA-Error
efe: AM5PR0602CA0021
ebe: AM6PR07MB5731
emsg: UserHasNoMailboxAndNoLicenseAssignedError

The Solution:
AmbientAuthenticationInPrivateModesEnabled value is changed from 1 to 0 under HKEY_LOCAL_MACHINE\ Software\Policies\Microsoft\Edge which fixed the issue

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You could click the "Accept Answer" button for this summary to close this thread, and this can make it easier for other community member's to see the useful information when reading this thread. Thanks!