The Note 9 is having issues where it says enter your pin and won't use your biometrics, but gets stuck in a loop back to the enter your pin screen. If you enter the correct pin it sticks in the loop. If you enter the wrong pin it will say incorrect pin so don't fool yourself into thinking you forgot your pin.
To clear this hold the physical power button on the side until the 3 options appear on your screen. Then hold the power off button until enter safe mode appears. It will ask your pin and actually accept it then boot into safe mode. Once in safe mode you can restart to normal mode when the question appears and it will be working normal again.
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