I have started playing Iron Banner for the week attempting to farm the grenade launcher, but I do not have access to the iron banner challenges anymore on my Titan. I got the first one for completing 3 matches, but now I can no longer progress the quest as it has disappeared, meaning I will be stuck at 1 of 4 challenges completed for the week. I checked my other characters and I can still see the quests on them, but I would like to use my titan. Any idea on how I can get these back so I can farm most efficiently?