[Users] Authentication Error for Gmail POP3 OAuth2 Account

[Paul]

On Fri, 25 Mar 2022 19:07:45 +0600
Dustin Miller <dustbiz at gmail.com> wrote: 

> Any hint, ideas, or suggestions of other things I could try, check,
> test, etc.?

Did you set up the account authentication methods:

'Receive' page
'Authenticate before POP connection', choose 'OAuth2'

'Send' page
'SMTP Authentication', choose 'OAUTH2'

with regards

Paul