Can’t use face id

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 Face ID isn't working on your iPhone or iPad Pro - Apple ...

Do you have a disabled Face ID alert on your device?

Please read the "What to do Next" section in this link, if nothing works as per the instruction given in this link --> If an alert says Face ID has been disabled on your iPhone or iPad Pro

bogacha Said:

"Can’t use face id: face ID don’t work, message say deep camera problem"

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Genuine Display Message:

Did you recently get a replaced screen? If you are getting notifications about a screen being ungenuine, then ask the person who replaced it to replace it once more, but this time with a genuine screen. The person should have known better. Elsewise, you'll continue getting the notification.  Learn More here: About Genuine iPhone Displays - Apple