I see this is an old thread, but I believe I'm having the same issue.
I recently purchased a KeyStep (which I dearly love), but when I tried to create a profile on MyArturia, I never received an activation email. I followed the ask for help link above, but it looks like I have to be signed in to ask a question. When I try to log in, it says "login is unavailable, your action is required," so I'm in the system but there's nothing I can do.
Thank you for any assistance you can provide