Cannot send mail via SMTP (version 3.16)

Google seems to be replying with a bad password or email address.   Have you verified they're good?

I'm not familiar with using google's smtp but I seems to remember having to use an app specific password to log in when using two factor authentication, I'd verify that as well if you are.

I've tried to login normally on web, that's good

but I've tried to add third party library (phpmailer), I can send mail