How can I play an animation on an NPC inside of a ViewportFrame?

I have an NPC inside of a ViewportFrame that I want to animate when you interact with it. The NPC is not anchored, and I've made sure my script works by using prints and I receive no errors.

Button.Activated:Connect(function()
	if not buttonActivated then
		local animation = Button.ViewportFrame.NPC.Humanoid:LoadAnimation(Button.Idle)
		animation:Play()
	end
end)