I'm constantly getting S ranked - yet my duo partner has yet to earn a chest from me.
I thought it was stated as long as one of your partners gets S Ranked in-game and your premade - it counts as them earning a chest for there played champion? Am I missing something - I've earned my chest, yet my partner hasn't been rewarded from me.
Edit: It appeared after they re-logged in and out again. Our bad, server delay.