I would like to know if I forget a device, will they show back up if they reconnect or attempt to connect to my WiFi? Is there a way to unforget a device? I had several devices show up on my connection, but were not connected, I forgot them, thinking I was blocking them, but regret not getting their information first and trying to figure out who they might be. I think it may be one of my children using a chat server and their friends showing up as unconnected guest on the WiFi?
As long as the password on your home network remains the same as the it was the first time they connected, they will be able to reconnect and the device will register as a new device in xFi.