NPC Animation works in Testing but not when I play the game?

local anim = Instance.new("Animation")
anim.AnimationId = "rbxassetid://8910536934"

local controller = script.Parent.Humanoid -- path to Humanoid/AnimationController
controller:LoadAnimation(anim):Play()


local prompt = script.Parent.ProximityPrompt
local promptevent = game:GetService("ReplicatedStorage").prompt

prompt.PromptButtonHoldEnded:Connect(function(player)
    promptevent:FireClient(player)
    script.Parent.Sound:Play()
end)

thats the only script, its inside the npc.