Mastery Tokens in URF

I think you actually can, I know in season 5 i think it was when you could actually pick your champion you could farm for your tokens.... Not 100% sure if you can now, i think it's Mastery 5 at the highest I THINK just bcs it;s the same i arams

It looks like no... My friend got S- on Amumu and didn't get a token for his mastery.(we both got a chest though)

--other note, i got 2 queues as TF where people dodged. ended up with 2 graves games in a row... doesn't really feel random imo.(i own about 70 champs)