Developer product script not working?

Hi guys! I made this script a few months ago and it was working fine....it is now not working :( Any ideas? Thanks!

local MarketplaceService = game:GetService("MarketplaceService")
local productId = 19750967
MarketplaceService.ProcessReceipt = function(receiptInfo) 

	for i, player in ipairs(game.Players:GetChildren()) do
		if player.userId == receiptInfo.PlayerId then
			
			if receiptInfo.ProductId == productId then
				
			player.PlayerGui.ChoosingMap.Frame.Visible = true
                       game.Workspace.ChooseMap.Value = true
			
			
			end
		end
	end	
	
	return Enum.ProductPurchaseDecision.PurchaseGranted		
end
	

I honestly see nothing wring with that code. Maybe it's how you're doing the rest of it. I see you're changing a value in workspace.. but this is a DevProduct so that could be risky, the value can change when you don't want it to.

Maybe if you elaborated on what this was for I could try to help more effectively.