i got my subscription working, maybe it's simple but I can't start android app with my registered key. Logging in on mobile browser is simple, scanning qr code and redirecting to google play store and mobile app too, but then app starts after installing with new user info. Simple thing like changing registered key in settings would be good enough to move further.
You can logout and login with your subscribed ID, simple copy-paste it in the application. If you can not login with the QR code scanner.
Thanks
So it's indeed simple, thank You, but not intuitive enough, at least login description.