cannot access Outlook

Question

UTC Date: 2026-01-05T17:51:17.966Z
Client Id: 9040D8ADBCF04502836A671D59367FE9
Session Id: bb5093a8-06cf-40f9-8da0-b9f956ca517a
Client Version: 20251212003.10
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.c25202d5.js:2:8735)
    at https://res.public.onecdn.static.microsoft/owamail/hashed-v1/scripts/owa.mailindex.c25202d5.js:2:41491
st: 500
ehk: X-OWA-Error
efe: MW4PR04CA0313
ebe: MW4PR14MB6094
ewsver: 15.20.9478.4

cannot access Outlook

Answer 1

Hi,

The error means your account doesn’t have an Exchange Online license yet, or your admin recently changed license settings.

What i suggest is ask your admin to assign the license by following these steps:

Sign in to Microsoft 365 Admin Center.

Go to Billing → Licenses.

Select the product (e.g., Microsoft 365 or Exchange Online).

Click Assign licenses.

In the pane, type the user’s name and select it.

(Optional) Turn apps and services on or off as needed.

Click Assign, then close the pane.

 

 

Once the license is assigned, the mailbox will be provisioned (this may take up to 24 hours). After that, Outlook Web should work normally. I hope this helps!