What's wrong with this gamepass script that is supposed to give a trail?

Here is a script that is suposed to give the player a trail but it does not work. Could anyone help me to fix it?

local passId = 1681075330

function isAuthenticated(player)
	return game:GetService("MarketplaceService"):PlayerOwnsAsset(passId)
end

game.Players.PlayerAdded:connect(function(player)
	if isAuthenticated(player) then
		player.CharacterAdded:connect(function(char)
			local trail = game.ServerStorage.TrailToad:Clone()
			trail.Parent = char.Head
			local attachment0 = Instance.new('Attachment',char.Head)
			attachment0.Name = 'TrailAttachment'
			local attachment1 = Instance.new('Attachment',char.HumanoidRootPart)
			attachment1.Name = 'TrailAttachment1'
			trail.Attachment0 = attachment0
			trail.Attachment1 = attachment1
		end)
	end
end)