[giovannibajo1]

Try training it for a few minutes for each finger (go to Touch ID setting, tap with your finger, see the background flash, repeat ad libitum slowly rotating your finger in any direction; be patient; eventually it should recognize each finger even if rotated almost 90 degrees). It should get much better afterwards

[krrrh]

Or use multiple slots for the one or two fingers that you actually use to unlock. One doesn't need to have every finger's fingerprint stored.