No quotes.
Interesting thing happened on my way to re-create and screenshot my attempt last night...
This morning I got a response, and followed thru:
pi@digipi3:~ $ sudo remount
Filesystem is now writable.
pi@digipi3:~ $sudo nano /etc/NetworkManager/NetworkManager.conf
...which apparently produced two items (that didnt get screenshot) this time.
Beneath them I created another
[device]
wifi.scan-rand-mac-address=no
exited, saved to buffer. Seems to have "taken."
Went back to DigiPi wifi settings, and entered my SSID and PW, restarted.
Hotspot gone, display says "Online" but no IP address, and I cant find it on my local network.
I can only speculate that the Pi was hung last night but behaved after a nice long power-down, or I have some other challenge going on.
I sense a lot more re-flashing in my future...