What email is the code sent to?

My email that my xbl account is linked too? Aka my @yahoo.com one. My hotmail one or this weird @xboxlive.com one I seem to have. The first too have no code. And the last one I don’t even know what it is.

Whatever e-mail you use to sign into xbox live DOT com with is the e-mail.

The one LINKED to your gamertag…