Can't complete the Stream Mission

There is a mission where you have to go to riot's site and watch LCS Live while connected to your account,I did that and it said that the rewards were added to my account but it bugged out and the mission is still there,help :|

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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