We're excited to announce that we've fully migrated the Xbox Forums to their new home, here on the Microsoft Community forums!
As of today, going to forums.xbox.com will redirect you here to the Xbox area of the Community forums. We've moved all of your existing threads over so you can continue and start conversations with the new forums experience.
We sincerely appreciate the feedback you have provided over this transition and can't wait for you to check out the new Xbox Forums!
It took me awhile to find this out too. Dead Rising 3 for example, start up your game and then start your single player game. Once in you should see a option in the party that says invite party to game.
I guess we're meant to play single player from now on because I still haven't found an invite to game option, and when there's an option in game to invite, the players invited never seem to get the invite notification, is this bugged?