Ever since MCF made the switch to Twitch I haven't been able to log into my account despite creating a Twitch account. Turns out the issue was that my browser was keeping me logged into the MCF account but this some how confused the site and it wouldn't let me sign in. So all I did was sign out of the MCF account and I was immediately able to finish the login process. I hope this is able to help others that are still having trouble logging in.