Why won't animations in npc's load?

I've literally been working all day on this dumb script because for some reason the animation won't load outside of studio. It works in studio in regular playing mode and on a test server. But when I try it in game it never loads.

Yes it is my animation. Yes it is the right id. There is no reason why it shouldn't work

Script:

local Animation = script:WaitForChild("Animation")
local Humanoid = script.Parent:WaitForChild("Humanoid")
local Action = Humanoid:LoadAnimation(Animation)

Action:Play()

Here is a snippet: https://gyazo.com/43d6a1a300f54f675f1814bbdce24a50

If you're loading an animation into an NPC you can use this ...

while wait(5) do
local animation = Instance.new("Animation")
animation.AnimationId = "ANIMATION LINK" -- your id here

local animTrack = script.Parent:LoadAnimation(animation) 
animTrack:Play()
end