After setting up everything, a popup appeared, where I could get a free license key for paid features. I clicked on “Sent me a free license key” but I didn’t receive a response. I did it three times and the email is 100% correct. This was about 4 hours ago.
I was able to solve the issue. As mentioned by a user in another post, I just tried with another email address and the license key was immediately delivered. This is very strange but I am glad the issue is solved.