Some connected Devices Massing

I have an odd situation which I hope someone can help with. I setup my new Wifi 6 Router (Netgear Nighthawk AX 6000 ROUTER) and all is working well, however, when attempting to view all connected devices on the network, I noticed that there are several devices which I know are connected but which are not displayed on the Connected Devices list on either the PC/Browser version or the Smart Phone (Android) Ap.

My Sony TV is definately connected to the net work. I have confirmed it has an active connection - but it is not listed on the list of connected devices. I have a few other devices that also do not sho w up - despite my confirming that they are definately  connected.

IS there a reasons some devices won't show up ? Anything I can do to make sure every device connected is listed?

thanks in advance for your assistance.

Geekser