. . . so the fix was to pull off the back plate and address fact that wire harness connector from outside facing fingerprint and numeric keypad input side of lock had come undone from backplate side of lock. This would logically explain why i could operate lock with app and add access codes but they wouldn’t work and why attempt to start add fingerprint setup procedure timed out.
Interesting that that neither telephone or chat support contacts i reached out to suggested i check that connector given the issue that was arising. I might expect i’m not the only person who made this end user installer error.