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In order to get a wildcard cert from lets encrypt.
You need to modify your DNS TXT record, then use the certificates you get with your solid config
sudo certbot -d host -d "*.host" --manual --preferred-challenges dns certonly --server https://acme-v02.api.letsencrypt.org/directory
replace host with your host
key = privkey.pem ; cert = fullchain.pem # in your config