I created a second account and did the quests. I noticed that there is a quest to do 5 brawl matches that awarded a brawl deck and a card sleeve. I noticed I didn't received any of these prizes in my main account, so I went back to my main account and saw the blue exclamation mark in the brawl unranked match. So I thought I still had the quest to do, but after five games the exclamation mark disappeared and no reward...