PLP2000 - one has three lights, other only two

I recently purchased a PLP2000 powerline kit. The devices pair correctly (both devices have pairing lights on and green). My hope is to be able to powerline output into a room in the back of the house, to a second router to broadcast a new wifi signal.

It appears that the devices can talk to each other appropriately, but that the second output device is not receiving data to be able to send to said router (brand new Netgear Nighthawk R6330).

Device A is plugged into the wall and has ethernet input from the Xfinity gateway modem-router. Device A has the ethernet light on and green (three lights on in total), so it appears to be receiving data from the modem-router.

Right now, Device B is plugged into the wall at an outlet adjacent to Device A (same room, same circuit) with an ethernet output to the router. Device B has the ethernet light off (only two lights on in total), so it appears not to be receiving data. The light does not change regardless if the router is plugged in or not.

I have tried resetting and re-pairing the powerline devices multiple times.
I have reset the router.
I have confirmed that the router can plug into the modem-router directly and give a Wifi signal with internet, so ruled the router equipment out as an issue.
I have tried many different outlets in the house. I am unable to plug both powerline devices into the same outlet because the device obscures the second outlet, but they are currently in adjacent outlets on the same wall.

I seem to be missing something and have scoured countless forums to try and resolve the issue. Does anyone have any ideas? If I cannot resolve this in the next two weeks I will be returning the equipment, sadly.