I'm new to the game and I'm playing on Xbox 360. I got the Mustang Unit Pack for single player, but then I saw you can use it for multiplayer. There is one problem, however. It seems that whenever I try to use a DLC unit in a person's match it remains grayed out in the Unlock Unit menu. But when I make my own map I can use whichever unit I want.

Is this supposed to happen to stop people from using OP units? Can I fix this?