Nice preview, but their JavaScript is messed up. I attempted to connect to beta in the Sign Up tab of their pop-up, but the error message for already having an account says, "Sorry, [object Object] is already registered with another account".
I just reported the bug with the appropriate team - should be an easy fix and resolved shortly. (In theory) it would only show if you already have an account though, so perhaps just try signing in instead of signing up?
