Didn't get the chest

I have one chest pending and I got an S- my last game and didn't get it. I am not sure if this is a bug or do you have to win the game to get the chest ? I don't know. I lost a game with Syndra, got an S- and didn't get the chest. And I know I had the chest available before I entered the game because you get a new chest every 7 days and I am getting the next one in 6 days so I've had this one pending for at least a day now. So do I have to win the game to get it ?
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