Script works in local server but not in team test/server?

I'm new to scripting, and I'm probably overlooking something simple here. I'm making a brick that when touched teleports you to a new area. This script works perfectly fine in a local server, but not in a team test or actual server. I do know that in an actual server the client is separated from the server, but I'd like to have an explanation on why this doesn't work. Any help is greatly appreciated.

function onTouched(hit)
local plr = game:GetService("Players"):GetPlayerFromCharacter(hit.Parent)
if plr then
plr.PlayerGui.Pop:Play()
plr.Character.Torso.CFrame = CFrame.new(-9999, 0 , -9999)
	end
end

script.Parent.Touched:Connect(onTouched)

Put a RemoteEvent in ReplicatedStorage and remplace line 4 for that

game.ReplicatedStorage.RemoteEvent:FireClient(Player)

add a LocalScript in StarterGui with ur sound and write this.

local debounce = true

game.ReplicatedStorage.RemoteEvent.OnClientEvent:Connect(function()
	if debounce then
		debounce = false
		script.Parent.Pop:Play()
		wait(1)
		debounce = true
	end
end)