I am experiencing this same issue. However, I am unable to revoke the license no matter what I try. I’ve been trying for days.
In the Manage Your Licenses section of the Account Dashboard I have updated the live and staging URLs and saved the changes for each. Tried to apply the license key to the live site and it gives the error message saying I need to revoke the license.
I tried doing what was suggested above and removing the live and staging URLs and saving the fields empty. I left this blank for a few hours, then went back in and added the correct live and staging URLs and saved each change. Still the license key wasn’t accepted.
I waited a day before trying the key again and still nothing. I have repeated this process multiple times and no luck. I have also tried looking on the WordPress dashboard for a way to remove the license from the old site and don’t see a way to do this.
Please, some assistance would be appreciated.