535 Incorrect authentication data

Infos:

  • Used Zammad version: 6.4.0-1731337700.f66ab5c6.jammy
  • Used Zammad installation type: source
  • Operating system: Linux Mint
  • Browser + version: Firefox 132

Expected behavior:

Being able to add outgoing email account

Actual behavior: 535 Incorrect authentication data

Steps to reproduce the behavior: I normally enter all the data that zammad asks me to create the email account in the outgoing emails everything goes well but when I go to configure outgoing emails it gives me the authentication error and I am 100% sure that the data does not have an error, I have even I tested the email with other software and it works without problems, only zammad fails me.