Reset Face ID If your iPhone's facial recognition still won't work, try a reset, then set it up again. Go to Settings > Face ID & Passcode. Enter your passcode if prompted. Tap Reset Face ID.15 nov 2021
Why does my iPhone Face ID not work after update?
Your current Face ID information might have been voided after the update and thus it's no longer working. If this is the case, you will need to reset Face ID so you can set it up again. ... Select Face ID & Passcode. Then tap the option to Reset Face ID.6 dic 2021