How to use GlobalData Store?

When using

:GetDataStore()

things save completely fine.

When using

:GetGlobalDataStore()

local Data = {}
local Http = game:GetService("HttpService")
--------
local DS = game:GetService("DataStoreService")
local CodeDS = DS:GetGlobalDataStore("asdasd333334dsf")

--------
local RepStorage = game:GetService("ReplicatedStorage")
local ServerStorage = game:GetService("ServerStorage")

function Data:CodeRedeemed(userId, code)
wait()
CodeDS:SetAsync(tonumber(userId).."_"..code, "Redeemed") 
warn'SET'
end
function setCodes(player, code)
if Data:CheckIfRedeemedCode(player.userId, code) then
warn'Code already redeemed'
else
Data:CodeRedeemed(player.userId, code) warn'Redeeming Code'
end 
end

function Data:CheckIfRedeemedCode(userId, code)
    if CodeDS:GetAsync(tonumber(userId).."_"..code) == "Redeemed" then
        return true
    else
        return false
    end
end

game.Players.PlayerAdded:connect(function(player)
    wait()
    if Data:CheckIfRedeemedCode(player.userId, "230-823-392") then
        warn'WHAT THE adsaddddddd'
    end
end)




game.ReplicatedStorage.code.OnServerEvent:connect(setCodes)

What am I doing wrong here?