On Xbox One, the in-game friend list does not reflect everyone on my Xbox friend list playing this game.
In addition, the in-game mail system does not consistently work even for those who are on the friend list, stating "Error: There is no player with that name". This is clearly not the case, as the person shows up as a player on my friend list. In some cases the problem is one way (ie one person can mail the other, but not vice versa), and it some cases it is both ways. Many of my friends have reported similar problems.
Is this a known bug that the developers are working to fix.