This is solved now. Thank you for your patience!
See original message below.
This shouldn't be happening: your license should be acitvated within a few minutes now.
Did you log in by visiting my.roli.com? You should see "Welcome to the My ROLI Community" on the landing page. If you see a page with four big orange buttons ("Visit www.roli.com", "Visit the store", etc.) then you are on the wrong page (accounts.roli.com). You need to navigate to my.roli.com. If you see the product registration page, then simply click "back" at the bottom of the page.
When you access my.roli.com for the first time, the activation process will be started. Reload the "Welcome to the My ROLI Community" until you see that the "JUCE Pro" license has been activated.
If this doesn't work then please pm me with your my.roli.com username or e-mail.
Once again, sorry for the inconvencience. We are working on a fix as fast as possible.