Xbox One users may be able to receive invitations to join in on online multiplayer games, but there is no guarantee that they will be accepted. Microsoft has not released any information about the invitations, and it is unknown if they are even being sent out at all. Some users have reported that they have been accepted, while others have not received any invitations at all. It is possible that Microsoft is not sending out invitations because the game servers are too busy or because there are not enough people interested in joining in on multiplayer games. If you do receive an invitation to join in on online multiplayer games, make sure to take advantage of it and try out the game before you decide whether or not to accept.