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UTC Date: 2026-01-28T18:48:11.417Z
Client Id: 5A2EB3ABE95845649771C962A91DA13B
Session Id: 2337a06c-3f2f-4244-8fb3-011f8d25cb5f
Client Version: 20260116004.03
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] (https://res.public.onecdn.static.microsoft/owamail/hashed-v1/scripts/owa.mailindex.a1ea87aa.js:2:8755)
at https://res.public.onecdn.static.microsoft/owamail/hashed-v1/scripts/owa.mailindex.a1ea87aa.js:2:41511
st: 500
ehk: X-OWA-Error
efe: DM6PR02CA0166
emsg: UserHasNoMailboxAndNoLicenseAssignedError
Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hello
Do you manage this account, or is it managed by your organization?
If you can access Admin Center https://admin.microsoft.com , go to Users > Active Users, click on your user, in the licenses & apps tab, can you share a screenshot of this tab?
The error message you are encountering, UserHasNoMailboxAndNoLicenseAssignedError, indicates that the user does not have a mailbox assigned and also lacks a valid license. This typically occurs when trying to access a mailbox or service that requires an Exchange Online license, but the user account does not have one assigned.
To resolve this issue, you should ensure that the user has an appropriate Exchange Online license assigned to their account. If the user is meant to have a mailbox, you can assign a license through the Microsoft 365 admin center. If the mailbox is intended to be used as a shared mailbox, consider converting it to a shared mailbox, which does not require a separate license.
For more information on assigning licenses and managing mailboxes, you can refer to the relevant documentation.