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I'm getting an Outlook 401 Error

GTD GÜMRÜK MÜŞAVİRLİĞİ 0 Reputation points
2025-07-10T13:15:34.6133333+00:00 
Hello, I can't access Outlook and I get a 401 error. Can you help me?

UTC Date: 2025-07-10T13:07:41.663Z
Client Id: 
Session Id:
Client Version: 20250704003.04
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.5ec1239e.js:1:1039)
    at https://res.public.onecdn.static.microsoft/owamail/hashed-v1/scripts/owa.mailindex.5ec1239e.js:1:163185
st: 401
efe:
Outlook | Windows | Classic Outlook for Windows | For business

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  1. Jade-T 8,530 Reputation points Microsoft External Staff Moderator
    2025-07-10T13:21:10.2633333+00:00

    Hi @GTD GÜMRÜK MÜŞAVİRLİĞİ

    Thanks for reaching out about this 401 error you're getting when trying to log into Outlook. I completely understand how frustrating it is to get locked out of your inbox, especially when everything was working fine just before. You're definitely not alone in facing this. 

    The Error 401 you're seeing is part of a known issue that Microsoft has officially acknowledged. It's currently affecting Outlook logins across various platforms, including desktop, mobile, and web. This means the problem isn't related to anything on your end, and you haven't done anything wrong! 

    Microsoft has identified this as a known issue, and they are actively investigating it. It appears to be affecting multiple users globally. 

    You can monitor the current service status via the Microsoft 365 Service Health Dashboard at this link: Microsoft service health status 

    At the moment, no action is needed on your part. Once Microsoft rolls out the fix, everything should return to normal automatically, and you'll be able to access your emails again. 

    Again, I truly appreciate your patience and understanding while Microsoft works to resolve this. If you have any other questions or need help with something else in the meantime, I'm here for 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".   

    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.

    1 person found this answer helpful.

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