[Advanced] Datastore2 not saving?

I posted a previous question about my datastore and was recommended to migrate over to datastore2, but it's not saving and I'm not sure why, this is first time using datastore2 so don't trash me on my code, I kinda got the gist of what to do from a devforum article.

local DataStore2 = require(1936396537)

local leaderstats1 = {
    ["Level"] = 0,
    ["XP"] = 0,
    ["MaxHealth"] = 120,
    ["Qalium"] = 0,
    ["HealthP"] = 0,
    ["SwordP"] = 0,
    ["MeleeP"] = 0,
    ["ClassP"] = 0,
    ["Points"] = 0,
    ["Tries"] = 10,
}
local leaderstats2 = {
    ["Element"] = "",
    ["Sign"] = "",
}

DataStore2.Combine("MasterKey","Qalus")

local function savedata(folder)
    local tab = {}
        for i,v in pairs(folder:GetChildren()) do
            tab[v.Name]= v.Value
    end
    return tab
end

game.Players.PlayerAdded:Connect(function(plr)
local   datastore = DataStore2("Data",plr)

    local folder = Instance.new("Folder", plr) folder.Name = "leaderstats1"

    for i,v in pairs(leaderstats1) do
        local intval = Instance.new("NumberValue",folder)
        intval.Name = i
        intval.Value = v
    end

    for i,v in pairs(leaderstats2) do
        local intval2 = Instance.new("StringValue",folder)
        intval2.Name = i
        intval2.Value = v
    end


    local data = datastore:Get()

    if data ~= nil then
        for i,v in pairs(data) do
            if folder:FindFirstChild(i) then
                folder[i].Value = v
            end
        end
    end
    for i,v in pairs(folder:GetChildren()) do
        v.Changed:connect(function()
            local tab = savedata(folder)
            datastore:Set(tab)
        end)
    end
end)