Please perform the following steps to resolve the issue:
1-Run the device in Safe mode and reconfigure the fingerprint.
2- Make sure to use the central fingerprint parts evenly when you register or scan fingerprint, so that all portions of fingerprint, including the center and corners have been fully scanned.
3- If issue still persists, create data backup and reset the device.
For further assistance, register your concern in Samsung members app (Open Samsung members app > click on “+“icon > send feedback > Error report/ Ask Questions).
Team Samsung Members