I am having a similar problem. I have a dongle for my Prophet V plugin.
Had an old account but it doesn't let me log in. I made a new account via ASC and it lists the two Prophet plugins on my system: v2 and the newly downloaded v3. The dongle doesn't wake my Prophet V (v2) activated, only demo.
Even though I seem to have created a new account via ASC, when I go to the website and try to log in, it doesn't recognize me. I tried to click technical support, but ridiculously it asks me to log in to ask a technical question about not being able to log in!! Super frustrating and no phone number! Also, when trying to log in, there are two fields just below the captcha that the website wants me to fill in, however there are no descriptions as to what I should be entering there. I ended up just typing periods, but it just returned me to a blank form to register. I'm really stuck here.
Arturia, help us!