Outllook.com error message: 401 - Unauthorized: Access is denied due to invalid credentials (II)

Question

Hi All,

I'm starting to face the same issue that is documented in

https://answers.microsoft.com/en-us/outlook_com/forum/all/outllookcom-error-message-401-unauthorized-access/fb186f3a-716b-4e56-b18a-e1f2c84dfb9e

When I try to access to my Outlook email by a browser (outlook.live.com) or using Outlook app, I always get an 401 HTTP error, but I can log in https://account.microsoft.com to access Onedrive or other Microsoft services normally. Can anyone help me to solve this issue?

Best regards.

Answer 1

Hi again,

this is the error I get (I have obfuscated some information):

UTC Date: 2025-07-10T07:33:23.069Z

Client Id: <XXXXXXX>

Session Id: <XXXXXX>

Client Version: 20250704003.04

BootResult: fail

Back Filled Errors: Unhandled Rejection: SyntaxError: JSON.parse: unexpected character at line 1 column 1 of the JSON data:undefined|Unhandled Rejection: SyntaxError: JSON.parse: unexpected character at line 1 column 1 of the JSON data:undefined|Unhandled Rejection: Error: 401:undefined|Unhandled Rejection: SyntaxError: JSON.parse: unexpected character at line 1 column 1 of the JSON data:undefined|undefined:undefined|undefined:undefined|undefined:undefined|undefined:undefined

err: Error: 401

esrc: StartupData

et: ServerError

estack: w@https://res.public.onecdn.static.microsoft/owamail/hashed-v1/scripts/owa.mailindex.5ec1239e.js:1:1039

S/</<@https://res.public.onecdn.static.microsoft/owamail/hashed-v1/scripts/owa.mailindex.5ec1239e.js:1:163185

st: 401

efe: LO4P123CA0061

Answer 2

Hola, tengo el mismo problema, saben cómo se puede resolver o hay que esperar?

Answer 3

Sto avendo lo stesso identico problema, non riesco ad accedere ne dal computer ne dall'app, ho provato in tutti i modi e non riesco a capirlo, vi allego la l'errore, soluzioni? (ho oscurato il client id e la session id per questione di privacy)

UTC Date: 2025-07-10T12:56:34.476Z
Client Id: (xxxxx-xxxxx)
Session Id: (xxxxx-xxxxx)
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: MI1P293CA0021

Answer 4

I have same issue since this morning

Answer 5

Estoy como tu, error 401.