S- on a lvl 5 Mastery Champion But no Lvl 6 Token?

I earned an S- in a game 12/0/18 as Lux, Yet I receive no lvl 6 token not even a chest or anything. Can you please tell me why? Considering the requirements for a lvl 6 mastery token is : Acquired by grading S- or above on a level 5 Mastery Champion..... This has taken me a while to get considering I don't LoL extremely often..... [] (http://file:///C:/Users/Nicholas/Pictures/Screenshots/Screenshot%20(18).png)
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