Hello Care Orchestra,
Thanks for writing in!
Yes you can easily assign the license to your new domain. You will need to revoke and validate the new site. To do that, please do the following:
1] Please go to X > Validation and revoke the validation (https://s3.amazonaws.com/community-themeco/app/uploads/2016/04/17110514/Capture53.jpg).
2] Login to your account and revoke the license.
3] After you have revoke the license, you need to re assign the license again to your new site using this url: https://www.example.com/. You have to make sure that url you just assign is the same as the one you have in your settings, Settings > General > Site Address
4] Go back to X > Validation of the new site, and insert your license code.
And please review the changes that we made on how you are going to validated your X theme because we made a big change in the process. Please check it out here: https://theme.co/apex/forum/t/setup-product-validation/55