"No device connected" for Wacom One tablet
Well well.   I plugged in my iPhone and the Wacome One woke up!

What does the first action have to do with the second?  Apparently the &quot;tremendous weight&quot; of the usb-c cable for the iPhone - which was a bit entangled with the mini-USB cable to the Wacom -  was just enough to put the Wacom connector out of sorts. Jiggling the cable to the iPhone apparently undid that &quot;flakey cable&quot; issue.
So the only potential value now to this question is to confirm YES the Wacom One is  working (surprisingly I might add) with macOS Catalina.
Update Apparently there is a specific power cord for Wacom that has a few parts including hdmi, power cable, mini-usb.  I must have tossed it / lost it some time ago.  So this device is a small-ish brick now.