The router is supporting both 2.4GHz & 5GHz. Not using mesh extenders, only the AT&T router, a Nokia BGW320-505.
From the router, I have a list of all connected devices, and only known devices are shown.
Will turn all off later today and see if indicator goes out. If it does, will reply to this discussion.
Otherwise, will live with an orange nightlight (it remains on even when printer is sleeping).
Thanks!