To use Let’s Encrypt in cPanel, you need to install a special plugin.
To do this, connect to the server by SSH and execute the command from the root user:
/scripts/install_lets_encrypt_autossl_provider
After installing the Let’s Encrypt plug-in, you can use it in the AutoSSL management menu (WHM >> Home >> SSL/TLS >> Manage AutoSSL).
If you need to remove the plugin, then run the command:
/usr/local/cpanel/scripts/uninstall_lets_encrypt_autossl_provider
See also:
Установка Certbot в Ubuntu