My error was I was working so much in the ssh world for a few hours that it didn't occur to me until late that this was not an OS issue but an application issue. Setting up key pairs, no matter how many times I've done it, is so damn error prone that a repetitive motion disorder takes over.
I would add for others making this trip that a global change may benefit them. In my case the actual command was:
the Omega setup Console page issue - try another browser or another
Connecting via the Expansion dock's USB cable to a serial Console - try another computer to confirm that this hardware and cable connection is working then fix the CP2102 driver issue on your Mac.