Why isn't my onPlayerLeft function saving Cash value?

I am able to get my player Cash value to load. When I spend money in game the leaderstats change how they should. When I leave and re-join, my player's Cash value is back to the starting_cash value. I am also getting an error saying "Argument 2 missing or nil". Can someone give any idea how to make the cash value actually save?

local Players = game:GetService("Players")
local CashDataStore = game:GetService("DataStoreService"):GetDataStore("Cash") 

local STARTING_CASH = 100

local function onPlayerAdded(player)
	local playerKey = "Player_" .. player.UserId
	
	print("User ".. player.UserId.. " Joined")

	local leaderstats = Instance.new("IntValue")
	leaderstats.Name = "leaderstats"

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

	local myCash
	local success, err = pcall(function()
		myCash = CashDataStore:GetAsync(playerKey) or STARTING_CASH
	end)
	if success then
		Cash.Value = myCash
		print("loading "..myCash)
	else
		-- Failed to retrieve data
	end

	leaderstats.Parent = player
end

for _, player in pairs(Players:GetPlayers()) do
	onPlayerAdded(player)
end
Players.PlayerAdded:Connect(onPlayerAdded)

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local function onPlayerLeft(player)
	local playerKey = "Player_"..player.UserId
	
	local savedCash = player.leaderstats.Cash.Value
	savedCash = CashDataStore:UpdateAsync(playerKey)
	print("User "..player.UserId.." disconnected")
	print("User has "..savedCash.." in the bank")	
	
end
Players.PlayerRemoving:Connect(onPlayerLeft)