Outlook sign in error

Question

I'm not able to sign in outlook anymore, the issue just popped up today out of the blue.

By accessing https://outlook.live.com/mail/0 i get the error descripted below.

UTC Date: 2025-07-10T06:37:31.660Z
Client Id: 20394EB0BB27497BB10E93419D1135F6
Session Id: bca5ea12-5e56-4e8e-84e0-d791a5ead2e6
Client Version: 20250620014.20
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.ad3a7e4e.js:1:1039)
    at https://res.public.onecdn.static.microsoft/owamail/hashed-v1/scripts/owa.mailindex.ad3a7e4e.js:1:161561
st: 401
efe: ZR2P278CA0074

Answer 1

Hi, I'm Estrella. I'll do my best to help you.

There are currently several reports of the same issue with Outlook. From what I’ve checked, it appears to be a problem with the service. You can check the status here: https://portal.office.com/servicestatus/

You will need to wait until Microsoft fixes the issue.