How to use Video Ads?

I've been attempting to implement video ads into my game, and I can't quite get the VideoAdClosed event to function properly. The idea is, someone joins the game and is eligible to watch an ad. They can click a GUI, and watch an advertisement to earn 2 in-game currency. The problem is this; After someone viewed an ad, the script claims they didn't watch it. When they didn't watch it(they'd already watched 5 ads in that hour,) it also claimed they didn't see the ad. I need the script to differentiate between when someone actually watched the ad, and when they didn't. Here's the code:

plr = game.Players.LocalPlayer
game:GetService("AdService").VideoAdClosed:connect(function(shown)
	if shown then
		plr.Tuudbucks.Value = plr.Tuudbucks.Value + 2
		script.Parent.Parent.Parent.Thanks.Visible = true
	else
		local thank = script.Parent.Parent.Parent.Thanks
		thank.Visible = true
		local cur = thank.TextLabel
		local te = cur.Text
		cur.Text = "Ad not shown. You may only watch 5 ads per hour."
		wait(3)
		cur.Text = te
		end
end)
 script.Parent.MouseButton1Click:connect(function()
	if plr:FindFirstChild("Alive").Value == false then
	script.Parent.Parent.Visible = false
	game:GetService("AdService"):ShowVideoAd()
	else
		local tx = script.Parent.Parent.TextLabel.Text
		script.Parent.Parent.TextLabel.Text = "You cannot watch an ad while you're in a game!"
		script.Parent.Parent.TextLabel.Text = tx
	end
end)