Org post see here

https://community.letsencrypt.org/t/getting-wildcard-certificates-with-certbot/56285

Reqeuirement access to dns records of the domain

wget https://dl.eff.org/certbot-auto
chmod a+x certbot-auto

./certbot-auto certonly –manual -d *.domain.example -d example.domain –preferred-challenges dns-01 –server https://acme-v02.api.letsencrypt.org/directory

You will be prompted to add two txt records to your dns server, you should be able to do this.

that´s all