got a error message

Toika Hudson 0 Reputation points
2026-02-19T20:09:41.36+00:00 
UTC Date: 2026-02-19T19:57:54.775Z
Client Id: PII removed
Session Id: PII removed
Client Version: PII removed
BootResult: configuration
Back Filled Errors: Unhandled Rejection: Error: 500:undefined|undefined:undefined
err: Microsoft.Exchange.Clients.Owa2.Server.Core.OwaUserHasNoMailboxAndNoLicenseAssignedException
esrc: StartupData
et: ServerError
estack: Error: 500
    at Object.w [as createStatusErrorMessage] (PII removed)
    at PII removed
st: 500
ehk: X-OWA-Error
efe: PII removed
emsg: UserHasNoMailboxAndNoLicenseAssignedError
Exchange | Licensing
Exchange | Licensing

The framework for legally deploying and using Microsoft Exchange Server or Exchange Online, based on server and client access models.

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  1. AI answer

    2026-02-19T20:09:50.6933333+00:00

    The error message you are encountering indicates that the user does not have a mailbox and no license assigned. This is reflected in the specific error: UserHasNoMailboxAndNoLicenseAssignedError.

    To resolve this issue, you should verify the following:

    1. Mailbox Assignment: Ensure that the user has an active mailbox assigned to their account in Microsoft 365.
    2. License Assignment: Check if the user has the appropriate license assigned that includes mailbox access.

    If the user is supposed to have a mailbox and a license, you may need to assign these through the Microsoft 365 admin center or contact your administrator for assistance.

    Additionally, if you continue to experience issues, consider checking the Microsoft documentation or support for further troubleshooting steps.

    References:

    AI-generated content may be incorrect. Read our transparency notes for more information.

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  2. Steven-N 25,315 Reputation points Microsoft External Staff Moderator
    2026-02-20T07:05:32.14+00:00

    Please note that Q&A forum is a public platform, and moderators will modify the question to hide personal information in the description. Kindly ensure that you hide any personal or organizational information the next time you post an error or other details to protect personal data.

    Hi Toika Hudson

    Thank you for posting the question.

    That OWA 500 error with Microsoft.Exchange.Clients.Owa2.Server.Core.OwaUserHasNoMailboxAndNoLicenseAssignedException / UserHasNoMailboxAndNoLicenseAssignedError is raised when the service can’t associate the signed-in identity with an Exchange mailbox.

    Given this, the below instructions might help:

    • Kindly assign an Exchange Online–enabled license to the affected user in Microsoft 365 admin center (Users > Active users > Licenses and apps, ensure Exchange Online is included)
    • Save changes.

    If it ONLY happen in Microsoft Edge:

    Set this Edge policy/registry value to stop the Edge-specific false “no mailbox” condition:

    AmbientAuthenticationInPrivateModesEnabled value is changed from 1 to 0 under HKEY_LOCAL_MACHINE\ Software\Policies\Microsoft\Edge

    Hope my answer will help you.

    If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".   

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