sermodi we're still optimizing our LE system help avoid rate-limiting on the opalstacked.com subdomain but we're not there yet.
If we're able to resolve that problem 100% then we'll look at issuing LE certificates for sub-subdomains of your user.opalstacked.com domains, but until then we're not able to do so.
We are able to issue LE certs for your own registered domains, ie domains that you've purchased via a domain registrar and have pointed at your Opalstack server.
