[jjnssn]

To follow-up: without changing anything on my Mac, (that I am consciously aware of);

I hooked my MBP back at it's original location on the other side of the network. This time, it could see the devices however they were taken by my PC.

I shut down my PC, came back to my Mac, and the devices were not visible.

I then went back, with the PC still off, power cycled both devices, then when I arrived back at my Mac, the devices were present within settings and EuCon had taken control.

I am back on 10.13.3, from 10.13.6, so don't know if "moving back" may be contributing to the behavior.