Marcio,
Looking at your passdb { } block, you don't have the "result_sucess =
continue" option.  Have you tried adding that to make it work?  

Sorry for late reply, lone busy admin here....

You spelled wrong, correct is result_success :

https://doc.dovecot.org/configuration_manual/authentication/master_users/

It is there, line 65 of https://pastebin.com/3cAvfNqB and yet no luck.

Thanks for your input.