Thanks for writing in!
First, let us try troubleshooting again. Just to make sure, we didn't missed some steps.
Please login to your account and assign the license. You need to assign the license to your site using the url you just assign in your WP Dashboard > Settings > General > Site Address.
Then, go back to X > Overview, and insert the license again.
Here's the complete guide on how you can setup your product license:
Hope this helps.