Hello, Marcos!
First, make sure you exactly followed the Installation and registration procedure:
https://docs.theme-vision.com/article/product-registration/
please check twice inserted data it’s a common mistake that customer leaves empty space before or after the data.
If you are sure that is no the case, then It’s most likely your hosting provider is blocking your website from being registered via the theme.vision host…
In that case, you will need to contact your hosting provider to enable PHP cURL connections to remote websites.
If you tried the above suggestions, and still no success, please give us the address to your website and WP admin username/ password, in the private reply so we can check what’s going on directly on your website.
Regards