@Relayer74 I assume you used a different e-mail address in the past? The license might be bound to your old Sony customer account e-mail address. All customer accounts where transferred from Sony to Magix. So you need to login with your old e-mail and password.
@Relayer74 I suggest you contact customer support at infoservice@magix.net
You'll first get a response from the AI customer support bot. Make sure you respond to it or select that it answer didn't help. It needs to know that you want help from a human support staff member. After that the bot should forward you to a staff member. But it can take some days until you'll get s response. Maybe Monday or Tuesday.