Thanks for writing in again!
Can you please confirm if you are getting any error at the time of validation?
Also, you can try adding the full URL of your website to the license.
The example in the secure note.
If that doesn't help please let us know your website details so that we can have a look.
Please provide the following information:
Set it as Secure Note
* Link to your site
* WordPress Admin username / password
All the best!