Fprint works amazingly well on my thinkpad. Worked fine for me on KDE Plasma 5 and also works on Plasma 6 for me too.

Weirdly enough, I’ve never got fprint working on my thinkpad (albeit I’ve only attempted twice).

Both times, it works fine whenever I only set up my index finger. Adding my thumb (or any other finger) then prevents either from working, removing either finger removes both, and then prevents me from adding it back.

I have no idea why I’m having this issue, but I’m assuming I’m just missing something.