I got issues trying to teleport all players to one part?

I previously tried to use this but it doesn't work

for i,v in pairs(game.Players:GetPlayers()) do 
	v.Character.HumanoidRootPart.CFrame = CFrame.new(workspace.tp) 
end

I need to be able to teleport all players to a map once its loaded and back when the map is unloaded/round is over but my teleport script doesnt seem two work

while true do
		local map = math.random(1, 4)
				if map == 1 then
					local gamespawn = game.Lighting.Map1.SpawnLocation
					local m = Instance.new("Message", game.Workspace)
					m.Text = "map1test" 
					wait(3)
					------------------------------
--					Code where all players get teleported into map
					------------------------------
					m:Destroy()
					local Map1copy = game.Lighting.Map1:clone()
					Map1copy.Parent = game.Workspace
					wait(4)
					------------------------------
--					Code where all the players get teleported back to the lobby
					------------------------------
					Map1copy:Destroy()
				elseif map == 2 then
					local m = Instance.new("Message", game.Workspace)
					m.Text = "map2test" 
					wait(3)
					------------------------------
--					Code where all players get teleported into map
					------------------------------
					m:Destroy()
					local Map2copy = game.Lighting.Map2:clone()
					Map2copy.Parent = game.Workspace
					wait(4) 
					------------------------------
--					Code where all the players get teleported back to the lobby
					------------------------------
					Map2copy:Destroy()
				elseif map == 3 then
					local m = Instance.new("Message", game.Workspace)
					m.Text = "map3test" 
					wait(3)
					------------------------------
--					Code where all players get teleported into map
					------------------------------
					m:Destroy()
					local Map3copy = game.Lighting.Map3:clone()
					Map3copy.Parent = game.Workspace
					wait(4) 
					------------------------------
--					Code where all the players get teleported back to the lobby
					------------------------------
					Map3copy:Destroy()
				elseif map == 4 then
					local m = Instance.new("Message", game.Workspace)
					m.Text = "map4test" 
					wait(3)
					------------------------------
--					Code where all players get teleported into map
					------------------------------
					m:Destroy()
					local Map4copy = game.Lighting.Map4:clone()
					Map4copy.Parent = game.Workspace
					wait(4) 
					------------------------------
--					Code where all the players get teleported back to the lobby
					------------------------------
					Map4copy:Destroy()
				end
end