When I either go in the Defined Groups and select Clients using this policy or when I simply go to Network-Wide Clients and search for devices assigned to a policy, it is blank.
Probably this Group Policy has not applied to the clients. Have you tested with another group policy?
It could be because we use identity PSK without Radius?
Nope, maybe the devia was not classified as Chromebook.
We have several different identity PSK's, Guest, Chromebook (Student), Sports....none of them show when we search by Group Policy
I got it, It's an 802.1X custom policy, but it should work, I just tested It, and worked as expected.
This is what is weird about it Click this, 344 Chromebooks
But when I click on the 344 Clients, I see traffic in the graphs, but no devices listed?
Can you see the 802.1x policy assigned on client detail?
Go to Network-wide > Monitor > clients then select a client.