I’ve played 3 matches of iron banner today, the quest only counted progress for the first match and the third match. First two matches were full games and the third one was a join in progress. I think IB bounty progress was normal but I’m not sure
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Like someone else said, if you get into the match with your artifact light boost still on, you will get no progress on iron banner quest or bounties, and neither will you get loot at the end of the match. I get this about one in five matches. Funny, you'd think they'd at least respond...