[CLIENT]I got S on Ahri and I didn't get hextech chest.

I got S on Ahri and I didn't get the mastery chest.MAJESTICSPAGHETT told me you don't get chests on nexus blitz https://support.riotgames.com/hc/ro/requests/36457239 ,but I've got chests on Irelia/IIIaoi/LeBlanc on nexus blitz on my second account 1stWiNTeR11.What is going on? https://imgur.com/a/kGdkA4a 1stWiNTeR1,EUW