Developer Product Purchased, wont do anything. Does it only work in game or is there a error?

local MPS=game:GetService("MarketplaceService")

local GP={
	Faster = 1,
	Higher = 2,
	Health = 3,
	Force = 4,
	Tools = 5,
	Jetpack = 6,
	Invisiblity = 7,
	Ghost = 8,
}
local DP = {
	ChangeTeam = 414465411,
}

local Teams = {
	Red = "Bright red",
	Yellow = "Bright yellow",
	Green = "Bright green",
	Blue = "Bright blue"
}

function ChangeTeam(player)
	local r = math.random(1,#Teams)
	for i,v in pairs(Teams) do
		if i == r then
			player.TeamColor = v
			player.Character.Humanoid.Health = 0 -- Kills Player To Respawn
		end
	end
end

MPS.PromptPurchaseFinished:Connect(function(player, assetId, isPurchased)
	-- Dev Products
	if assetId == DP.ChangeTeam and isPurchased then
		ChangeTeam(player) -- Change Team
	end
end)