How can I get my Face ID back
Face ID have been disabled
Question marked as
If FaceID has been disabled, you’ll need to follow this guidance:
If an alert says Face ID has been disabled on your iPhone or iPad Pro - Apple Support
If you unable to resolve problem, you would be well advised to seek assistance directly from Apple Support:
You might also visit the Genius Bar at your local Apple Store or Apple Authorised Service Provider (AASP) - where the technicians will be able to test and assess your iPhone: