finger print login misbehaving, claims new fingerprint is duplicate

[Steven]

fprintd
User login has 2 existing fingerprints (thumb and index). Attempting to add 3rd middle finger results in error "print is duplicate". Attempting to add using ring, little or other finger also fails.
~$ lsb_release -rd
No LSB modules are available.
Description: Ubuntu 24.04 LTS
Release: 24.04
apt-cache policy fprintd
fprintd:
  Installed: 1.94.3-1
  Candidate: 1.94.3-1
  Version table:
 *** 1.94.3-1 500
        500 https://atl.mirrors.clouvider.net/ubuntu noble/main amd64 Packages
        100 /var/lib/dpkg/status
attempting to report via apport failed
attempting to gather details via FindRIghtPackage failed (instructiosn do not match what displays on system)
Searching on help.ubuntu.com, ubuntu forums and ask ubuntu did not show this issue, although other problems with fingerprint login were reported.