Why doesn't my datastore work, it doesn't print anything or give errors?

I followed theDevKings tutorial on datastores and yet it doesn't work. It could be that my script is outdated as the video is almost a year old.

Here is the script:

local dataStoreService = game:GetService("DataStoreService")
local dataStore1 = dataStoreService:GetDataStore("dataStore1")
local dataStore2 = dataStoreService:GetDataStore("dataStore2")

game.Players.PlayerAdded:Connect(function(plr)

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

    local Flips = Instance.new("IntValue",leaderstats)
    Flips.Name = "Flips"
    Flips.Parent = leaderstats

    local Money = Instance.new("IntValue",leaderstats)
    Money.Name = "Money"
    Money.Parent = leaderstats

    local userID = "Player_"..plr.UserId

    local flipdata
    local moneydata
    local success, errormessage = pcall(function()
        flipdata = dataStore1:GetAsync(userID)
        moneydata = dataStore2:GetAsync(userID)
    end)

    if success then
        Flips.Value = flipdata
        Money.Value = moneydata
    else
        warn(errormessage)
    end

end)

game.Players.PlayerRemoving:Connect(function(plr)

    local userID = "Player_"..plr.UserId

    local flipdata = plr.leaderstats.Flips.Value
    local moneydata = plr.leaderstats.Money.Value

    local success, errormessage = pcall(function()
        dataStore1:SetAsync(userID, flipdata)
        dataStore2:SetAsync(userID, moneydata)
    end)

    if success then
        print("Cool, data saved")
    else 
        print("Not cool, data not saved")
        warn(errormessage)
    end
end)