"No device connected" for Wacom One tablet

Solution 1:

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 "tremendous weight" 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 "flakey cable" 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.