I don't seem to get DataStoreService working on Roblox

I cannot get to save data in a roblox game.

local players = game:GetService("Players") 
local dss = game:GetService("DataStoreService")
local gameData = dss:GetDataStore("Nara")
players.PlayerAdded:Connect(function(player) 


    local leaderstats = Instance.new("Folder") 
    leaderstats.Name = "leaderstats" 
    leaderstats.Parent = player 


    local coins = Instance.new("IntValue")
    coins.Name = "Coins"
    coins.Parent = leaderstats

    local success, result = pcall(function()
        local r = gameData:GetAsync(player.UserId)["Coins"]
        
        return r
    end)

    if success then
        print("success: " .. result)
        coins.Value = result
    else
        print(result)
    end




end)

players.PlayerRemoving:Connect(function(player)
    print("player removed")
    local key = player.UserId
    
    local data = {
        ["Coins"] = player:WaitForChild("leaderstats").Coins.Value
    }
    
    local success, err = pcall(function()
        gameData:SetAsync(key, data)
    end)

    if success then
        print("Data saved successfully")
    else
        print("Failed to save data with error: ", err)
    end
    
end)



game.ReplicatedStorage.Buy.OnServerInvoke = function(player, item)
    if not player:FindFirstChild(item) then
        if player.leaderstats.Coins.Value >= game.ReplicatedStorage.Items:WaitForChild(item).cost.Value then
            player.leaderstats.Coins.Value = player.leaderstats.Coins.Value - game.ReplicatedStorage.Items:WaitForChild(item).cost.Value
            local owned = Instance.new("BoolValue")
            owned.Name = item
            owned.Parent = player
            player.Backpack:ClearAllChildren()
            game.ReplicatedStorage.Items:WaitForChild(item):Clone().Parent = player.Backpack
            return item
        else
            return "not enough coins"
        end
    else
        player.Backpack:ClearAllChildren()
        game.ReplicatedStorage.Items:WaitForChild(item):Clone().Parent = player.Backpack
        return "owned " .. item
    end
end

i tried more ways i dont know whats wrong.

I was expecting for the Coins IntValue to be saved then loaded when player joins. I tried everything but didnt get it to work. The value is created and nothing destroyed it. The code gets stuck at pcall for saving, tried to see where using print. Thanks

Have you enabled studio access? If not, you could read this documentation on how to enable it: https://create.roblox.com/docs/cloud-services/datastores

By default, experiences tested in Studio can't access data stores, so you must first enable them. Accessing data stores in Studio can be dangerous for live experiences because Studio accesses the same data stores as the client application. To avoid overwriting production data, do not enable this setting for live experiences. Instead, enable it for a separate test version of the experience.

To enable Studio access in a published experience:

1. Go to Home > Game Settings > Security.
2. Enable the Enable Studio Access to API Services toggle.
3. Click Save.