Here's how to set up Face ID or Touch ID again.
Open the Settings app, and from the list of apps shown at the bottom of the screen, select this app.
Then turn on Face ID or Touch ID.
If the option isn't there, open this app, turn off Passcode Lock on the settings screen once, then turn it back on to set it up again.
If that still doesn't work, please contact us using the "Contact Us" button at the top right.
Thank you.