Problem with email recognition

I bought capture one 20. I installed it. when he asks me for login credentials, he tells me that the email does not exist. But my account is active. So, I try to create another account but it refers me to the existing and active one. Basically, I can't register my license and I can't use C1. I am really very disappointed. And from the assistance they can't help me. Can someone help me? What can be the problem and the solution? thank you so much.