Let me clarify few things here first. Each license can be used to validate production and staging servers, so that you don't have to revoke any license to validate another.
Most probably you're using an older version of Pro theme, so that our validation process will not initiate correctly. You can check the latest version numbers from here (https://theme.co/apex/forum/t/troubleshooting-version-compatibility/195).
If you're still having issues, provide us with your WordPress credentials in a secure note to check this issue.