Are you sure your fingerprint is recognize and enable by the system?
What about share this information with us?
lspci
lsusb
or you can install hw-probeand executed with sudo hw-probe --all
and share with us this file → /root/HW_PROBE/LATEST/hw.info/devices.json
You can check the status of the service:
sudo systemctl status fprintd.service
Note
you can find some informatio here too: → Issues · libfprint / libfprint · GitLab and check is was reported in upstream…
References
https://fprint.freedesktop.org/
https://help.gnome.org/users/gnome-help/stable/session-fingerprint.html.en
Warning
is seems your devices is unsoported… try you find yours here: