@Steven-Betito Thank you Steven, I also went to "main domain & ssl", but it does not let me choose another Domain Name, I click on the arrow down to get the list but it has no effect and the SSL didn't work yet after 3 days.
Redirect everything to main domain
You need to add this CNAME in your domain provider to validate the SSL certificate
CNAME Key: _117459ddeea79b005195419a1572dd73
CNAME value: _0d5feebe950xxxxxxxx
On the left column, "Domains & Emails", I already added 2 domain names and they got the GREEN DOT OK