Domain has no website, and DNS-based validation is not possible

When I try to generate new Let's Encrypt SSL certificate for domain by command:

virtualmin generate-letsencrypt-cert --domain davidbubenik.cz --dns

I am getting: .. failed : Domain has no website, and DNS-based validation is not possible

Without --dns it works, but I need to do wildcard, so I need dns validation

Status: 
Active