Trenched changed it's name in the US to Iron Brigade to match the UK name. However, in doing so, it has been disabled on consoles which have it through game-sharing. Starting the game will result in it attempting to update, which it can't do unless you sign in as the account on which the game was bought. Use the purchasing account, let the update complete, start the game up, then quit and log out. Now that console is capable to run the game again.
This just happened to my friend with whom I shared this game, and I figured this out for him. Now the game works again. Just a heads-up!