Why is the animation:Play() not working? *specific title*

i don't really know what's the issue in here but i assume that the Zombie humanoid won't work unless it's in the zombie model so try doing that and here's my solution and try editing it as you please if something is wrong with it

local climbingAnimation = script.ClimbingAnimation --its better to just give the animation a name
local touched --i'll bind and unbind the function instead of having a debounce

function onTouched(hit)
	local ancestor = hit:FindFirstAncestorWhichIsA("Model") --find the character/zombie model
	if ancestor and ancestor:FindFirstChild("Zombie") then --check if the ancestor exist and has a "Zombie" humanoid in it
		touched:Disconnect() --unbind the function from the event "clear things a little for optimization i guess?"
		local zombie = ancestor.Zombie --get the zombie humanoid
		local track = zombie:LoadAnimation(climbingAnimation) --load the animation track
		track.Looped = false --you can just toggle looping in the animation editor
		track:Play() --play the animation
		spawn(function()
			wait(2.2) --i don't know what's the purpose of the cooldown but since you had it i don't want to mess with it
			touched = script.Parent.Touched:Connect(onTouched) --bind the function again
		end)
	end
end

touched = script.Parent.Touched:Connect(onTouched) --binds the function