RBR750 and RBS350 Ethernet

The attached network diagram shows the satellite as "not connected". (Notice the slash mark through the WiFi symbol.

I am much more confident in the Orbi web interface Attached Devices information about Orbi satellites.

Are you able to access the web interface and see what it reports about the two satellites?

(using a laptop or tablet.  phone screens are too small to be practical with the web interface.)

It would help to know more about the Ethernet connecting the router to satellite.  Is it:

• In house wiring that has been terminated in RJ45 plugs/jacks, plus perhaps a patch panel and/or drop cables on one or both ends?
• Or, a purchased Ethernet cable that was snaked through the house (perhaps through an attic) and is connected directly to the router and satellite?  (no home terminations. no wall jacks. no patch panels or switches)

My next step would be to connect a computer in place of that wired satellite and verify that it gets a good connection to the router.  (Alas, now that fewer people purchase desktop computers and laptops no longer are equipped with Ethernet ports, this has become somewhat impractical for many users.  I purchased some Ethernet to USB adapters so that I can connect such laptops, tablets, and Chromebooks directly to Ethernet.  Under $20 on Amazon.  Not something that a "non-nerd" would find much use for.)

The second step would be to temporarily relocate that wired satellite to the same room as the router and connect it with an Ethernet cable.  Not only should Attached Devices depict it as 'wired', but the Advanced Tab home page Show Statistics box should show the LAN port as connected 1000M/Full.