API Services are enabled yet I'm still getting the API Services Error?

Hello, I've made a DataStore in which it'll save the value "Power" I have enabled API Services, HttpService, Create and Save Place API, and yet it still comes out with this error:

API Services rejected request with error: HTTP 0 (HTTP 403 (HTTP/1.1 403 Forbidden))

Here is the code:

local DataStore =  game:GetService("DataStoreService")
local ds = DataStore:GetDataStore("PowerSaveSystem")

game.Players.PlayerAdded:connect(function(player)
    local leader = Instance.new("Folder", player)
    leader.Name = "leaderstats"
    local Power = Instance.new("IntValue", leader)
    Power.Name = "Power"
    Power.Value = ds:GetAsync(player.UserId) or 0
    ds:SetAsync(player.UserId, Power.Value)
    Power.Changed:connect(function()
        ds:SetAsync (player.UserId, Power.Value)
    end)
end)

game.Players.PlayerRemoving:connect(function(player)
    ds:SetAsync(player.UserId, player.leaderstats.Power.Value)
end)