It seems that in 22.04 it was possible to setup fingerprint login in the Settings -> Users panel, but in 24.04 the corresponding Control-Center -> MATE User Management panel has no such option. Nevertheless, I was just prompted to update the fingerprint firmware (which I did), so clearly my system & hardware is capable of doing so.
Someone please tell me how to do this on version 24.04 LTS of Ubuntu MATE (6.8.0-51-generic).