I understand you create subdomains for every new site, right? The Bitnami HTTPS configuration tool doesn't support wildcard domains so you will need to use the lego tool directly to configure the wildcard domains certificates. We have this guide where we explain how to use lego
However, instead of running this command
sudo /opt/bitnami/letsencrypt/lego --tls --email="EMAIL-ADDRESS" --domains="DOMAIN" --domains="www.DOMAIN" --path="/opt/bitnami/letsencrypt" run
you will need to use DNS validation to generate the certificates. You can learn more about the different challenges available in Let's Encrypt here and the lego documentation is in Github.
Happy to help!
Was my answer helpful? Click on