In order to activate cPanel license, follow below steps:
- Purchase a cPanel license direct from cPanel Store or from your provider.
- Login to your server via SSH.
- Run /usr/local/cpanel/cpkeyclt command and wait until the process finish.
Need to show something similar if everything is okay with your licence.
Updating cPanel license…Done. Update succeeded.
Building global cache for cpanel…Done
Your license is activated now and it will be active until its due date.
As well you can check this page https://verify.cpanel.net/app/verify by adding your IP.