Instance.new not working in serverscriptservice script?

I made a script for a game in serverscript service that adds a leaderboard and checks if they own a shirt:

game.Players.PlayerAdded:Connect(function(player)
	
	local MarketplaceService = game:GetService()
	local ASSET_ID = 471780910
	local PlayerOwnsAsset = MarketplaceService.PlayerOwnsAsset
	
	local leaderstats = Instance.new("Folder")
	leaderstats.Parent = player
	leaderstats.Name = "leaderstats"
	
	local Rank = Instance.new("StringValue")
	Rank.Parent = leaderstats
	Rank.Name = "Role"
	Rank.Value = player:GetRoleInGroup(5667550)
	
	local Priority = Instance.new("BoolValue")
	Priority.Parent = player
	Priority.Name = "Priority"
	Priority.Value = false
	
	local success, doesPlayerOwnAsset = pcall(PlayerOwnsAsset, MarketplaceService, player, ASSET_ID)
	if doesPlayerOwnAsset then
		Priority.Value = true
	else
		print(player.Name .. " doesn't own priority")
	end
	
end)

It worked when it was just the script to add a leaderboard but when I implemented the shirt check system it stopped creating new instances. I want it to check if a player owns an asset then if they do than it sets a boolvalue in the player to true. And now it doesnt create the value or the leaderstats.