If you have a VPS or Dedicated server, then you will know about CPanel License. For using CPanel License we need to purchase CPanel License and it's monthly recurring. If for any reason CPanel License Suspended, Then we can't login to CPanel & WHM.
After purchasing license again, we need to run this below code to login to WHM or CPanel.
To Re-Activate or Updating CPanel License, run the cPanel License Key update script (perhaps if you've upgraded from a trial license, or switched IP addresses), simply run the following at the command line or terminal.
If you have any problem reactivating or updating CPanel License, let me know through
activare cpanel licenta how to update cpanel license whm reset cpanel license