Why does this script only play the animation in Studio?

Hello. I am having a problem with this script.

Whenever I try to play the animation in Roblox Studio, it works. When it is in the normal game, it does not work. The script works until the "track:Play()" section.

It is a global script located in ServerScriptService.

game.ReplicatedStorage.PlayAnim.OnServerEvent:Connect(function(plr)
	local Anim = Instance.new("Animation")
	Anim.AnimationId = "rbxassetid://ID"
	local char = plr.Character
	local hum = char:WaitForChild("Humanoid")
	local track = hum:LoadAnimation(Anim)
	print(plr.Name.." tries to play Anim!")
	track:Play()
end)