Getting 403 error when trying to save leaderstats data how do I fix?

I just want to save the value of wins and im getting this error:

17:27:44.287 - 502: API Services rejected request with error. HTTP 403 (Forbidden)

This is my code located in a script called Stats in ServerScriptService

I got most of this from the guide on scriptinghelpers about saving and loading data

local DSS = game:GetService("DataStoreService")

local datastore = DSS:GetDataStore("GeneralSaveData", "Players")


game.Players.PlayerAdded:connect(function(player)
    local leaderstats = Instance.new("Folder")
    leaderstats.Name = "leaderstats"
    leaderstats.Parent = player

    local wins = Instance.new("IntValue")
    wins.Name = "Wins"
    wins.Value = 0
    wins.Parent = leaderstats
end)

function generateDataKey(player)
    local ret = "uid_" .. player.userId
    return ret
end

function generateDataTable(player)
    local dataTable = {
         -- CHANGE THESE TO ADAPT TO YOUR LEADERSTATS
        Wins = player.leaderstats.Wins.Value
    }
    return dataTable
end

function saveDataForPlayer(player)
    local key = generateDataKey(player)
    local data = generateDataTable(player)
    datastore:SetAsync(key, data)
end

function inputDataToPlayer(player, data)

    player.leaderstats.Wins.Value = data.Wins
end

function loadDataForPlayer(player)
    local key = generateDataKey(player)
    local data = datastore:GetAsync(key)
    inputDataToPlayer(player, data)
end

game.Players.PlayerAdded:connect(function(player)
    loadDataForPlayer(player) --Load first thing when they join
    player.leaderstats.Wins.Changed:connect(function()
        saveDataForPlayer(player) --Save the data when Wins changes value
    end)
end)

game.Players.PlayerRemoving:connect(saveDataForPlayer) --Save data when the player leaves the game