Why doesn't my DataStore/Leaderboard work?

Hey. Thanks for Clicking :) So, my next game uses a Datastore to save the Player's Leaderstats. I have two problems with this.

1. When the player wins a game, a win is not added to the leaderboard.
2. I dont know if it stores or loads their data, because there is never anything to store. I'll post that anyway. Here's the script that is supposed to add a win.

function awardwin(players)
    if type(players) == type({}) then
	print("player is in table") -- this prints

        for i = 1, #players do
	if players[i]:FindFirstChild("MatchTag") then
            if players[i]:FindFirstChild("leaderstats") then
                if  players[i].leaderstats:FindFirstChild("Wins") then 
                    local stat = players[i].leaderstats.Wins
                    stat.Value = stat.Value + 1
					print("added wins") -- this never fires
					
                end
            end
        end
    end
end
end

This is when the function is called in the main script.

while localtimer > 0  do
	print("Run")
	wait(1)
	localtimer = localtimer - 1
	activecontestants = {}
	for _, player in pairs(contestants) do
		if player then
			local character = player.Character
			if character then
				local humanoid = character:FindFirstChild("Humanoid")
				local matchtag = character:FindFirstChild("MatchTag")
			if matchtag and humanoid and humanoid.Health > 0 then
				table.insert(activecontestants, player)
			end
			end
		end
	end
	if #activecontestants <= 1 then
		awardwin(players)
		awardcredit(players, 4)
		
		break

	end
end

Finally, this is where the player's data is saved

game.Players.PlayerRemoving:connect(function(player)
    local newTab = {}
    local tab = myData:GetAsync(player.userId)

    local num = 0
    for i = 1,#tab do
        num = num + 1       
        for a,b in pairs(player.leaderstats:GetChildren()) do
            if b.Name == tab[i][1] then
                table.insert(newTab,{tab[i][1],tab[i][2],tab[i][3]})
            end
        end
        if num % 10 == 0 then
            wait()
        end
    end
    myData:SetAsync(player.userId,newTab)
end)

Thanks for the help!

Is it a personal server If not it wont work!