Fprintd/fingerprint gui


I used to have fingerprint setup & working with solely fprintd. Quite a few months later & starting afresh. I have installed both fprintd & fingerprint-gui & registered fingerprints but just can’t get the fingerprint gooey to show for login. Sudo auth in terminal shows error:

(process:3749): libfprint-async-WARNING **: 21:56:06.980: usb_open failed, error -3

I did read both Arch Wikis but seem to be missing something vital? Hardware is an ancient ThinkPad X200.