I had requested a "Sandbox" type setup where new devices are put into it until the notification to the owner has been either blocked or allowed. They would not be able to access anything until approved.

This would be great for old forgotten devices and new.

Just adding my two cents here:

Have a teen who loves to "accidentally" let his private mac address get enabled on his iPhone.

I have the notifications setup to announce eero notifications on my AirPods, so I can respond rather quickly, but it would be nice if eero would do this standard.

Another, clunkier solution I've thought is that if eero integrated with Apple Shortcuts, a shortcut could be setup so that if new device joins network, new device is blocked.

Overall I like the eero system, but this is moving from annoying to show-stopping for our family/environment.

Have been monitoring this thread for a couple years, ever since buying my Eero system (wish I had before buying!). Completely agree that this relatively basic feature should be added immediately.  Seems like a decent programmer could do this in an afternoon.  So disappointing to wake up to “new devices added to your network” without any control over it, and then have to do reverse MAC searches to try to figure out if it’s really something I own.  A “quarantine” feature would be perfect; a new device that somehow has the network password would be placed in quarantine and blocked until admin approves.  I just submitted my own request to customer support, and suggest everyone who has replied here already or is now reading this to do the same.  It’s clear Eero is NOT reading these threads given the lack of any reply here or action taken.

This would be really useful, I have a user who keeps using an insane amount of bandwidth and they won't curb their behavior so I block their device. A few days later they are back on after spoofing the MAC address. So it's a game of whack-a-mole.

My children are circumventing the parental blocks by turning on MAC privacy and logging into the network.   Please implement this feature...