Reissuing - When and how to do it When should I reissue my WHMCS License Key? You should reissue your WHMCS License Key whenever you change any of the Valid Information (Domain, IP or Directory) or whenever you encounter an Invalid License Error. How do I reissue my WHMCS License Key? If you have a WHMCS License Key direct with ourselves, and you have an account with us, then you simply login to your WHMCS.com account here: https://www.whmcs.com/members/clientarea.php a