I've several email accounts configured in Odoo v13. 

Today while I was configuring another email account, I went to google to activate the access of less secure Apps and here  https://support.google.com/accounts/answer/6010255 they have that : 

" To help keep your account secure, starting May 30, 2022, Google will no longer support the use of third-party apps or devices which ask you to sign in to your Google Account using only your username and password."