Face ID
I had Face ID set up then it stopped working I turned it off and tried to set it up again but it won’t work the camera works fine
iPhone X, iOS 13
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See Set up Face ID on iPhone https://support.apple.com/guide/iphone/set-up-face-id-iph6d162927a/ios
More importantly see If Face ID isn't working on your iPhone or iPad Pro https://support.apple.com/en-us/HT208114 "If you still need help, reset Face ID, then set it up again. Go to Settings > Face ID & Passcode and tap Reset Face ID. Then tap Set up Face ID to set it up again. If you can’t enroll your face, take your device to an Apple Retail Store or Apple Authorized Service Provider or contact Apple Support." Of course you can't use this option at this time. You'll need to contact Apple Support.