Sorry for the issues you're having viewing devices on your network. I imagine that's frustrating to deal with, especially when you're looking to use improved security. Let's see what's going on and come up with a fix for you.
I do have a few questions that might point us in the right direction.
If you can give me a little more information, I'm sure we can get this worked out. I look forward to hearing back from you.
I'm using the Home app (Andriod) and toggling the slider to "Use WPA3 security" under settings. I was experiencing this issue when I bought the nest devices and posted this (many weeks ago), over several days. However I've just tested again and now it seems to list all devices connected, when previously the list was empty.
Not sure if there has been a patch applied to the App, or to Andriod, but it seems to be working now.
Thanks for following up. There was a recent update that was pushed out, so it's possible that your apps and devices received that update (they apply automatically) and it set things straight for you. As we have our answer, I'm going to go ahead and close up the thread, but if you have any new issues or this pops up again, please feel free to open a new discussion.