Can't sign in outlook Server Error: 401:undefined|undefined:undefined

Anonymous

UTC Date: 2025-07-10T00:19:57.157Z
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: KL1PR01CA0055

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46 answers

Anonymous

2025-07-10T16:48:32+00:00

working now

Can't sign in outlook Server Error: 401:undefined|undefined:undefined

Does anyone know the answer for this? Or do we have to try and contact microsoft
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Anonymous

2025-07-10T16:08:03+00:00

working now
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Anonymous

2025-07-10T15:59:55+00:00

Not mine dang it.

Have not received send/receive since 12:36am, almost 12 hours ago
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Anonymous

2025-07-10T15:57:58+00:00

Yes!! I do
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Anonymous

2025-07-10T13:54:05+00:00

Since this morning my hotmail is broken with the same error.
In several mail clients and the web outlook it's not working.
I can login to my account page, open Word, Excel Powerpoint Web but as soon as I try Outlook it fails.
And it seems to take MS way too long to fix this.

What a bad experience :-(
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