@Vickyh999 Unfortunately sometime happens and you need to delete the fingerprints and register again. However if issue develops again may need to clear the cache partition, some think this is advisable after major updates anyway as this deletes the temporary files without affecting your Data. In Android 11:
I do not work for Samsung or make Samsung Products but provide independent advice and valuable contributions.
My Device- S21 Ultra 5G ( SM-998B/DS ) CSC= BTU , 12GB/256GB
One Ui 5.0,Android 13 .
I'm having the exact same problem in my A40 after the update, the sensor won't let me to register the fingerprint.