This happens to me a lot. I'm doing challenges and the rest of my fire team gets credit and loot from it and I do not. I just did 5 400 level strikes for the weekly challenge and it only reads 1 out of 3 given credit for. My fire team hung around after they finished theirs in 3(as expected) and I've been stuck on 1! Last week I did the 540 Spider bounty with my fire team and they got credit and loot and I got nothing! This is crap. Fix your game!