give %player% diamond 2
player-message: "&eThanks for voting for us on %service%, you have been rewarded with 1 Voting Key."
broadcast-message: "&e%player% has voted for us on %service% and was rewarded with 1 Voting Key!"
This should fix it ;) (By the way, make sure formatting is right!)
Superbvote doesnt give rewards to players. Here is my config file. https://pastebin.com/ENN5G4Sk