If you received a new server and you're trying to create your first account but receive the following error:
Missing HOST Config Line in /etc/wwwacct.conf
You need to setup a proper hostname, something that resolves to your domain. For example, you could use: server1.mydomain.tld, just be sure to substitute mydomain.tld with your actual domain.
Afterwords, you'll need to update your license internally by logging in via ssh as root and running:
/usr/local/cpanel/cpkeyclt