Personally, my fingerprints often fail to read the same way over some weeks of dry climate, especially if I've done any manual labor. And before you say anything about dry skin, putting lotion on is a temporary DoS attack on the fingerprint scanners I own, so that's not great either.
I can re-train the fingerprints, and they work for some weeks again.
A more successful workaround I've found is teaching the machine the side of my finger, not the pad.
Thanks for the tip. I have iPhones and iPads that have fingerprint readers and they all invariably fail to read my prints after a while (And I have 3-4 prints stored per finger). It’s frustrating. Sometimes it’s due to dryness but other times I have no explanation for.
I can re-train the fingerprints, and they work for some weeks again.
A more successful workaround I've found is teaching the machine the side of my finger, not the pad.