Hi johnmb77,
Thank you for using the Apple Support Communities.
It sounds like Face ID on your iPhone isn’t working as expected and we are happy to help.
"If you need help using Face ID to unlock your iPhone or iPad, authenticate purchases, sign in to apps, or if you're asked to enter your passcode, learn what to do": If Face ID isn't working on your iPhone or iPad Pro.
If you see the alert "Face ID has been disabled," follow these steps: If an alert says Face ID has been disabled on your iPhone or iPad Pro
If you see "Face ID is Not Available," make sure that your iPhone is updated to the latest version of iOS. Learn how to Update iOS on iPhone. If your iPhone is already updated, Restart your iPhone, then try to Set up Face ID on iPhone again.
If the issue persists, contact Apple Support for further assistance.
Best regards.