Works fine for non https.
You will need to:
1) go to "Domain Setup" in DirectAdmin and enable SSL for your domain.
2) go to "SSL Certificates" in DirectAdmin and setup a proper certificate for your domain, it is currently using the server cert which is not valid for your domain. Chose the leftmost option "Get automatic certificate....", you can leave most as default, just make sure to enable it for all subdomains you need.