Hi all, I just got xfinity gigabit this morning and upgraded my setup from an Arris 802.11ac gateway to an Amplifi HD 802.11ac mesh router. All of my devices are connected and working fine *except* the Airport Express units I use as Airplay targets. I've tried rebooting everything and factory resetting the Expresses, but when I try to connect to them to the network using Airport Utility on my Mac it errors out (with the entirely unhelpful "An unexpected error occurred. Try again.") Does anybody have any insight? Is there any reason they shouldn't be able to connect to (but not extend) this particular router? Thanks!