How to fix fingerprint sensor on Samsung?
Check the sensor: Make sure the sensor area is clean and free of smudges. Check your screen protector: Make sure your screen protector is attached properly and tightly. Remove and re-register your fingerprint: You can do this by going to Settings, then Biometrics and Security, then Fingerprints. Scanner Surface Contamination: Dirt, oil, moisture, or residue on the fingerprint scanner surface can interfere with accurate reading. Even microscopic particles can disrupt the sensor’s ability to capture clear fingerprint ridge patterns necessary for recognition.