The finger sensor is very slow in my M31. Six GB Ram is only for memory in m31 mobile not for software speed. Redmi Note 9 Pro with 6 GB Ram works better and give faster speed.
Dear Samsung Member,
Greetings from Samsung Customer Support!
Please perform the below mentioned steps to resolve the issue:
* To improve recognition performance, re-register fingerprints of the hand used most often to perform tasks on the device.
For further assistance, register your concern in Samsung Members Application (Open Samsung Members Application > Get help > Send Feedback > Error report/Ask questions).
Thank you for writing to Samsung.
Samsung Customer Support