In the Autotune -> Facebook App section, you need to set an email address for the "User Support Email" and "Contact Email" fields. If you are setting an email address in there, Facebook may be rejecting it due to it being a domain or top-level domain (.tk, etc) that they don't recognize or accept.
If possible, I'd recommend using an @gmail.com or similar, very popular, email address.. though any valid email *should* work.
I hope that helps,
Alex
help me
