all of my IP reservations gone? Eero says there are "zero devices" on my network

I have an enormous network, over 40 smart home devices, plus a slew of phones, tablets, desktops, laptops, printers, TVs, etc.  I have painstakingly addressed all my devices across three subnets.

I've been using a pihole to serve DNS, configured within the Eero as the only DNS server.  For some unrelated reason, that machine went down and remains down, so I added the Eero gateway as secondary DNS, and I'm trying to connect a new device to replace the expired pihole.  I can't ping it, but the eth port is lit up and flashing active.  I can't address it via http either.  The Eero main screen indicates that it's connected, however when I drill into network settings/reservations it tells me that there are zero devices connected.

the Eero app won't let me change back to ISP DNS... when I hit SAVE, it warns me that I'll need a reboot, but nothing happens.  My only option is repeatedly press the useless save button, or cancel without applying changes.

What fresh hell is this?

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