@Woodfly 

Hi, Thank you very much for your time and patience.

It should be Deco W7200_V2.

Are you still experiencing the following issues?

Devices that say they are offline but are in fact online and functional. They don't show in "ONLINE".

-It is similar to the feedback here-https://community.tp-link.com/en/home/forum/topic/697580. 

If you are still troubled with this issue, please help me submit an APP log(How to submit Deco APP log) so that the engineer can check whether a beta firmware could be requested. 

There are 19 offline devices that call themselves "network device".  When I look up the MAC vendor there is no such vendor. Several different MACs and devices.
- I think it is very likely to be caused by the "Private/Random MAC address" which has been adopted by many mobile phones, especially iPhones.

https://support.apple.com/en-us/102509

I can't ping a LOT of the devices on my network, but they are in fact, functional and online. Whether I am on the same network (main) or the guest network.  I have about 40 devices on my network. some wired, some wifi Main, some wifi guest.

-On the Guest network, the devices are isolated from each other so they are not ping-able.

While It is not supposed to happen on the Main WiFi Network and Ethernet network.

For the wired devices, are they connected to the main Deco?

Thanks a lot and best regards.