The DKIM key is perfectly installed.

The problem is that the mails arrive with the DKIM key failing.

Checking DKIM in: https://www.appmaildev.com/br/dkim and other 5 online tests, everyone can't get DKIM.
My DNS and config files are all ok.
I Can send and receive emails. But unfortunately without DKIM configuring correctly I will not be able to send emails to some providers like hotmail for example.