Here is how to set up Face ID (face recognition) or Touch ID (fingerprint recognition) again.
Open the Settings app, select this app from the app list, and turn on Face ID or Touch ID.
If you do not see the option there, open this app, turn off "Passcode Lock" once in the app's Settings screen, then turn it back on and set it up again.
If it still does not work, please contact us using "Contact Us" at the top right.
Thank you.