How do I fix this errror UTC Date: 2025-11-28T10:33:34.428Z Client Id: E85A96C5B8C4402A99145995C6ABAD38

Daryl Gadson 0 Reputation points
2026-06-25T02:24:57.17+00:00 
UTC Date: 2026-06-25T02:08:48.536Z
Client Id: 
Se
Client Version: 20260612016.27
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
st: 500
ehk: X-OWA-Error
efe: 
ewsver: 
reqid: 
cv:
Outlook | Outlook for mobile | Outlook for iOS | For education
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  1. Jade Ng 15,225 Reputation points Microsoft External Staff Moderator
    2026-06-25T02:55:58.37+00:00

    Dear @Daryl Gadson,

    First of all, I want to begin by sincerely apologizing for the frustration and inconvenience this issue has caused you.

    To understand the situation and be able to offer you relevant suggestions, I would need a little more information from you. Kindly help me in providing the following information. 

    May I double confirm that you checked with your admin if your account still has license? To check this kindly sing into https://admin.microsoft.com/Adminportal/Home#/homepage with Admin credentials > choose Active User under Users >click on your username > choose Licenses and apps > Expand Apps > Make sure that Exchange Online (Plan1 or 2) is selected. If your account has license kindly uncheck it and reapply it then wait the sync period to see if it will make any difference.

    Untitled Untitled

    If you don't have Admin privilege, kindly contact your organization Admin to check above for you. 

    You may also refer to: Getting a mailbox not found error in Outlook on the web - Microsoft 365 admin | Microsoft Learn. 

    If the issue still present, you may also (use admin account to) go to Office 365 Admin Center > Support > New Service Request. The support engineers there have the correct escalation channel, and this is the most efficient way to report such issue. You can refer to this article to check the way how to raise a ticket: Ways to contact support for business products - Admin help.

    I look forward to your response. Kindly note that the above requested information is required for further analysis and troubleshooting of your situation.

    Your patience and cooperation are much appreciated. Have a nice day! 

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

    Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

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