MarketplaceService script not working?

This script had no errors in the output. All I'm trying to do it make it so when you click the brick it prompts you to buy something.

local click_detector = Instance.new('ClickDetector', script.Parent)
local tool = game.ServerStorage.CandyBar
click_detector.MouseClick:connect(function(player)
 if game:GetService("MarketplaceService"):PlayerOwnsAsset(player,172535092) then
	print("Has asset")
else
	print("Does not have asset")
	game:GetService("MarketplaceService"):PromptProductPurchase(player, 172535092, false, Robux)
end
end)