Method 1: First you open your phone's settings. Later, go to Biometric and Security inside it. Then after click on biometric and security, go inside it to the other security settings. Then find clear credentials click on it and clear it. Then remove fingerprints and add fingerprints again. And check that your fingerprint scanner is running correctly or not if not so see second method.
Method 2: Restart your phone and when the phone is turned on then the Samsung logo appears, then when you see that logo press and hold the volume down button, Until the phone starts, then your phone will go into safe mode, then you check your fingerprint scanner if it runs correctly then your This problem is coming due to some third party application. Then restart your phone again so that you come from safe mode to normal mode. Then after trying in normal mode, remove the useless application and once fingerprint scanner check your problem will be solved.
