Making a script to follow friends?

I'm aware of this script on the wiki that lets you follow friends:

function followPlayer(player, targetUserId )
	local success, errorMsg, placeId, instanceId = game:GetService'TeleportService':GetPlayerPlaceInstanceAsync(targetUserId)
	if success then
		game:GetService'TeleportService':TeleportToPlaceInstance(placeId, instanceId, player)
	else
		print("Teleport error:", errorMsg)
	end
end

However, this script only works on following a user in the current game, not with universes' teleport place. What do I need to change?