To resolve "fingerprint" issue kindly follow the given below steps:-
1. Try after register a new fingerprint. To register a new fingerprint:- Settings> Bio metric and security>Fingerprints > Continue > Set secure screen lock > Start with center.
2. Reset the device and before resetting the device make sure to create backup of your device via Smart Switch mobile application or http://www.samsung.com/in/support/smartswitch pc suite Settings > General Management > Reset.
After performing the troubleshooting steps if the issue still persists, kindly get back to us with additional information- Error log File, Video or Screen-shots. This will help us to further investigate and resolve your concern (Samsung Members app > Get help > Feedback > Error report/ask question). Note: Please send device log files within 15 minutes of issue occurrence along with the exact issue details.
