I'm using s21 FE and after Jan Update, I'm getting this weird bug where sometimes the fingerprint sensor doesn't work when my phone is locked. The fingerprint symbol also disappears. It only appears when I double click to open the lock screen, and then it works
We acknowledge your query and apologize for the same. Please perform the below mentioned steps to resolve the issue:
* To improve recognition performance, 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).
