Office 365 new aplication get ERR Authentication failure: unknown user name or bad password

[rcaloMMT]

Hi, we have been successfully implement the proxy for a year, last week we try create a new app followimg the same steps as before, but now we alway get the same error, we are sure about the user y pass because we can login through the browser

2024-04-29 13:13:27: POP (10.1.2.90:64286-{172.15.0.1:1995}-outlook.office365.com:995) --> b'USER user@domain.com\r\n' 2024-04-29 13:13:27: POP (10.1.2.90:64286-{172.15.0.1:1995}-outlook.office365.com:995) <-- b'+OK\r\n' 2024-04-29 13:13:27: POP (10.1.2.90:64286-{172.15.0.1:1995}-outlook.office365.com:995) --> b'PASS xxxxxx\r\n' 2024-04-29 13:13:27: POP (10.1.2.90:64286-{172.15.0.1:1995}-outlook.office365.com:995) --> b'AUTH XOAUTH2\r\n' 2024-04-29 13:13:27: POP (10.1.2.90:64286-{172.15.0.1:1995}-outlook.office365.com:995) <-- b'+ \r\n' 2024-04-29 13:13:36: POP (10.1.2.90:64286-{172.15.0.1:1995}-outlook.office365.com:995; user@domain.com) <-- b'-ERR Authentication failure: unknown user name or bad password.\r\n' 2024-04-29 13:13:36: POP (10.1.2.90:64286-{172.15.0.1:1995}-outlook.office365.com:995; user@domain.com) <-- b'-ERR Authentication failure: unknown user name or bad password.\r\n'

i saw a similar issue but don't say how he solved, any idea?

Office 365 CCG always ends in ERR Authentication failure: unknown user name or bad password #238

[simonrob]

I presume you removed one or more outgoing lines from the proxy log between 2024-04-29 13:13:27 and 2024-04-29 13:13:36 (the submission of the OAuth 2.0 token). Assuming this is present, I would suspect some sort of misconfiguration on the Azure/Entra side.

[rcaloMMT]

as you say, the problems was on a MS config.

Thanks,.