Your license could not be activated because:

Your license could not be activated because:
Unactivated License File
1. First, go to http://verify.cpanel.net/ and enter the public IP address of this server to make sure it is licensed.
2. If licensed, try running /usr/local/cpanel/cpkeyclt from the command line as root.
3. You'll also need to make sure that port 80 is open to contact our license server and that your server's hostname is a FQDN.

Resolution :

1 ) /usr/local/cpanel/cpkeyclt

if no luck then

2) Check with your Data Center if your IP/subnet that you are using for each IP is correct ?

Hopefully this will help to get the issue resolved.