The Xbox 360 had a great party chat system where you can talk to your friends in the same or completely different games. This hasn’t been the case with the Xbox One’s however, as there is a current inability to chat in cross-game parties.
Major Nelson answered questions about the problem in a Reddit thread, saying they’re working on the matter and it’ll get better soon.
We unfortunately don’t have a timeline as to when it’ll be coming but since the console is only two weeks old, it could even be somewhere around next year. It’s odd though that Microsoft wouldn’t include this as it was one of the Xbox 360’s crowning features.