Anyone who's having problems where it doesn't read your finger at all or very rarely. Try rebooting the phone and see if it helps at all. if you notice an improvement it might be a calibration issue. Try going to
https://pixelrepair.withgoogle.com on your computer using Chrome and install the fingerprint calibration software onto your device.
Let me know if this works for anyone else.
Im fully updated, using tempered glass screen protector with increased touch sensitivity on. I noticed that the fingerprint sensor only worked for an hour or so after rebooting before not recognizing my thumb anymore so I tried the calibration software and it seems to have helped a little. The fingerprint scanner is very slow but if I hold my finger there long enough it will unlock on first or second try.