Unable to access my Outlook/hotmail email account. Error 401- RESOLVED

TeresaM 370 Reputation points
2025-07-10T05:49:26.7866667+00:00

Something is wrong with my personal email account, as other members of my family are able to access their Outlook email accounts. When I try to log on to Outlook (hotmail) on my phone or on my PC, I receive the following error message. I need to be able to access my emails. Please advise on how I can resolve this. I have already reset my password and cleared my cache and history.

UTC Date: 2025-07-10T05:33:04.707Z
Client Id: 8798D6BD74FF43679B325E07B4F542E7
Session Id: 85f3e46d-11d3-463d-bf21-b26d2fb91ceb
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: PH8PR20CA0019
Outlook | Windows | Classic Outlook for Windows | For business

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Answer accepted by question author
MER 270 Reputation points
2025-07-10T10:31:01.1633333+00:00

I have spoken with Microsoft this AM via live chat and its a known issue which is effecting some users. They are working on the issue and hope to have it resolved asap

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60 additional answers

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  1. Laurk 10 Reputation points
    2025-07-10T15:18:41.96+00:00

    I just received a pop up on my PC that an email was sent to me on how to resolve outlook access, but I have not received the email in my Outlook, because it is not working! Why would Microsoft send an email? How can I fix this?

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    2 people found this answer helpful.
  2. Stuart Munro 0 Reputation points
    2025-07-10T15:13:20.6966667+00:00

    Generally same issues with me - UK - but I find on my phone the emails 'flash' into the notification and then dissaper with a note that they can not be read, Worrying because I noticed an urgent medical related email but it has completely dissapeard.

    When will this get sorted?

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  3. Loris Guarise 0 Reputation points
    2025-07-10T15:12:45.1166667+00:00

    I have the same issue from this morning in Italy, ERROR 401

    UTC Date: 2025-07-10T15:09:48.528Z
    Client Id: 84635E761FC84F4587D4065578EA64B9
    Session Id: 2ec8a87e-22a3-49d0-a30b-414ebb873bc0
    Client Version: 20250620014.20
    BootResult: fail
    Back Filled Errors: Unhandled Rejection: SyntaxError: Failed to execute 'json' on 'Response': Unexpected end of JSON input:undefined|Unhandled Rejection: SyntaxError: Failed to execute 'json' on 'Response': Unexpected end of JSON input:undefined|Unhandled Rejection: Error: 401:undefined|undefined:undefined|undefined: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: AM6PR04CA0026
    

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  4. Mikel 0 Reputation points
    2025-07-10T15:11:53.5833333+00:00

    Same issue from Spain

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