UserHasNoMailboxAndNoLicenseAssignedError

Question

Hello,

One of the user login to Edge using Outlook Web Mail. He gets the below message

UTC Date: 2022-11-08T11:06:40.946Z
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

I can login with my mail address in EDGE. Same user able to login to Outlook Web Mail using Chrome Browser.

Once mail address entered in the OutlookWebAccess in EDGE the Select Next. It does not prompt to enter the password.

EDGE Browser Histroy is cleared and tried

Please help

Answer 1

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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Answer 2

Hello @Amit Singh @Aholic Liang-MSFT

Thanks for helping me.

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

Answer 3

Hi @Boopathi S ,

Same user able to login to Outlook Web Mail using Chrome Browser.

Have you tried to log in to this account using the private window and does the error persist?
If yes, please try logging in with another computer to see if it can work.

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Answer 4

The error message "UserHasNoMailboxAndNoLicenseAssignedError" indicates that this is a license issue. It could be that the admin has not assigned an Exchange online license to your account yet, or in some cases, it could be that your admin has changed in license settings lately. Since this is a license-related issue, unfortunately, the only way to go about this is by reaching out to your admin.

Please refer to this article: https://answers.microsoft.com/en-us/msoffice/forum/all/something-went-wrong-we-couldnt-find-a-mailbox-for/6480660c-db0d-4c2f-b04d-9e01ab2a4f3d

Answer 5

UTC Date: 2025-07-10T10:55:47.624Z
Client Id: C27C26952E9D46458648AB94E9828644
Session Id: 3007424f-a277-407f-b599-0fdc96b4125e
Client Version: 20250704003.04
BootResult: fail
Back Filled Errors: Unhandled Rejection: Error: 401:undefined|undefined:undefined
err: Error: 401
esrc: StartupData
et: ServerError
estack: Error: 401
    at Object.w [as createStatusErrorMessage] (https://res.public.onecdn.static.microsoft/owamail/hashed-v1/scripts/owa.mailindex.5ec1239e.js:1:1039)
    at https://res.public.onecdn.static.microsoft/owamail/hashed-v1/scripts/owa.mailindex.5ec1239e.js:1:163185
st: 401
efe: DX0P273CA002

we are facing this above issue.

kindly fix it this problem ASAP.