Datastore script wont save data?

I've been working on this for like 5 days and can't figure it out because I have tiny brain. I've asked for help here multiple times but no matter what I do it won't work. I know the saving won't work because the data loading works completely fine.

Here's the code I have:

-- Written by MattVSNNL 

local PlayersService = game:GetService("Players")
local dataStoreService = game:GetService("DataStoreService")

local boolDataStore = dataStoreService:GetDataStore("BoolDataStore")

PlayersService.PlayerAdded:Connect(function(player) 

	local onMenu = Instance.new("BoolValue") 
	onMenu.Name = "onMenu" 
	onMenu.Parent = player 

	local onMenuData = nil 

	pcall(function() 
		onMenuData = boolDataStore:GetAsync(player.UserId.."-onMenu") 
	end)

	if onMenuData ~= nil then 

		onMenu.Value = onMenuData 
	else
		onMenu.Value = true 
	end

end)

local bindableEvent = Instance.new("BindableEvent") 

PlayersService.PlayerRemoving:Connect(function(player) 

	pcall(function() 
		boolDataStore:SetAsync(player.UserId.."-onMenu", player.onMenu.Value) 
	end)

	bindableEvent:Fire() 
	print("Saved!") 

end)

game:BindToClose(function() 
	while #PlayersService:GetPlayers() > 0 do 
		bindableEvent.Event:Wait() 
		wait() 
	end
end)

Hello! Here is what you need to do:

-- Written by MattVSNNL

local PlayersService = game:GetService("Players")
local dataStoreService = game:GetService("DataStoreService")

local boolDataStore = dataStoreService:GetDataStore("BoolDataStore")

PlayersService.PlayerAdded:Connect(function(player) 

    local onMenu = Instance.new("BoolValue") 
    onMenu.Name = "onMenu" 
    onMenu.Parent = player 

   onMenu.Changed:Connect(function()
		boolDataStore:SetAsync(plr.UserId, onMenu.Value)
	end)

end)

game.Players.PlayerRemoving:Connect(function(plr)
	ds:SetAsync(plr.UserId, plr.leaderstats.onMenu.Value) 
end)

Also make sure that "Enable Studio Access to API Services" is enabled in your game.

I'm not 100% sure if it's going to work, but if it does not, I'm here to help!

-KoalaKo_XD

Make sure "Enable Studio Access to API Services" is enabled in your game settings.

-- Written by MattVSNNL 

local PlayersService = game:GetService("Players")
local RunService = game:GetService("RunService")
local dataStoreService = game:GetService("DataStoreService")

local boolDataStore = dataStoreService:GetDataStore("BoolDataStore")

function loadData(player)
	local key = player.UserId .. "-onMenu"
	
	local onMenu = Instance.new("BoolValue")
	onMenu.Name = "onMenu"
	onMenu.Parent = player
	
	local success, data
	
	repeat
		success, data = pcall(boolDataStore.GetAsync, boolDataStore, key)
	until success or not PlayersService:FindFirstChild(player.Name)
	
	if success then
		onMenu.Value = data or true
	end
end

function saveData(player)
	local key = player.UserId .. "-onMenu"
	local onMenu = player:FindFirstChild("onMenu")
	
	if onMenu then
		local onMenuValue = onMenu.Value
		local success, result
		
		repeat
			success, result = pcall(boolDataStore.UpdateAsync, boolDataStore, key, function() return onMenuValue end)
		until success
	end
end

PlayersService.PlayerAdded:Connect(loadData)
PlayersService.PlayerRemoving:Connect(saveData)
game:BindToClose(function() 
	if RunService:IsStudio() then
		task.wait(2)
	else
		local finished = Instance.new("BindableEvent")
		local allPlayers = PlayersService:GetPlayers()
		local leftPlayers = #allPlayers

		for _,player in ipairs(allPlayers) do
			coroutine.wrap(function()
				saveData(player)
				leftPlayers -= 1
				if leftPlayers == 0 then
					finished:Fire()
				end
			end)()
		end

		finished.Event:Wait()
	end
end)