Can't configure the key

Hello,

I have installed a new WP on a new subdomain and I installed GeneratePress 2.1.4 and downloaded and installed from the website GP premium 1.7.3. When I tried to configure the premium version, it appears a message "Sorry, you are not allowed to access this page".
This is a brand new WP, I haven't installed any additional plugins. It's basically empty website.
I reinstalled the premium version, but it doesn't work.
I have already added this website to the managed sites in my profile to Generate Press website (Just in case :))

Could you tell me how can I fix that?

Thanks!
Iliyana