This plugin is based on certbot-dns-ispconfig and automates the DNS challenge for DuckDNS domains
pip install git+https://github.com/lennart-k/certbot-plugin-duckdns
certbot certonly \
--authenticator duckdns \
--duckdns-token=TOKEN \
--agree-tos \
--preferred-challenges=dns
-d "qed.duckdns.org" \