Can't register eLicenser

I’m trying to register my eLicenser but it gives me this message:
“This eLicenser number has already been registered by another user.”

what can I do?

Hi and welcome,

If you are sure you haven’t registered this eLicenser (btw is it Soft-eLicenser or USB-eLicenser) by using another MySteinberg account, contact official Steinberg support, please.

Can you pls tell me what is contact email for steinberg support, because i also have that problem