Kindly follow the below mentioned steps to resolve the issue-
> If any screens guard/tampered glass/protection film is available then first disables the fingerprint settings and then removes the screen guard.
> Once screen guard is removed now register the fingerprint again and check the issue
> Make sure to use the central fingerprint parts evenly when you register or scan fingerprint, so that all portions of fingerprint, including the centre and corners have been fully scanned.
For further assistance, register your concern in Samsung members app (click on “+“icon>send feedback>Error report/ Ask Questions).
Samsung Members Team