I can't get the ssl certificate

[sch1z00]

My servus works on a raspberry with an associated dyndns address, I imagine that the nostr relay that it makes available on the network is traceable only if associated with an ssl certificate.
Unfortunately I can't get the certificate either using the sudo options --ssl-acme[-production] --contact-email <contact_email> or through the acme.sh script (I don't know which directory to put in acme.sh --issue -d example.com -w /home/wwwroot/example.com, I tried with /.../sites/localhost but it doesn't work, with a classic /var/www/html it works)