Seriously, there is no consistency. Sometimes it works sometimes it doesn't. Yet, Invite to Fireteam works perfectly every time. Whatever you're doing there, put it in Summon. Waiting to get a fireteam for 20 minutes on content no one plays only to have summon fail with no explanation is -blam!-. Also, rethink the button orders for Applications. You have... Decline Applications Right Next to Send Friend Request Invite to Fireteam is right next to Join Fireteam Fat finger one button away does the opposite.