Can someone please tell me what I'm doing wrong...

A - Player 1
B - Player 2

Both are on different xboxes.

I invite A to B's player match party. A goes to playercard and hovers over 'save and exit'. B changes the lobby to private and changes the settings to Unlimited time and 30000 score limit. B changes lobby to combat training and makes sure Enemies says 1 as well as Friends. B then changes the map to nuketown (tried it with and without changing map). B backs out of the lobby and A presses 'A' right when he backs out, then clicks "save and exit" (i've done save and exiit, pressed b, and cancel). A invites B back to the player lobby, and after 10 seconds changes it to wager match then quickly back to player match.

It then shows the other person as 'matched player' and the game doesn't start at all. On B's screen it shows they are in a combat training lobby.

I'm even willing to give a 48 hour code to the person who tells me what I'm doing wrong so I can get it working.