Face ID is not working on iPhone
Face id was not recognized since yesterday and now as i reset face id and trying to setup new face id it say fac id not available….
[Re-Titled by Moderator]
Face id was not recognized since yesterday and now as i reset face id and trying to setup new face id it say fac id not available….
[Re-Titled by Moderator]
If you still need help, reset your Face ID, then set it up again. Go to Settings, tap Face ID & Passcode, then tap Reset Face ID. Next, tap Set up Face ID to set it up again.
If Face ID isn't working on your iPhone or iPad Pro

Parts and service history
With iPhone 12 models and later using iOS 15.2 and later, you can go to Settings > General > About to see the parts and service history of your iPhone and you can see if the camera has been replaced. If the repair was done using genuine Apple parts and processes, you will see "Genuine Apple Part" next to Camera.

This message doesn't affect your ability to use your iPhone or access your camera.
Learn more about iPhone parts and service history.

If your iPhone's camera has been previously replaced, repaired, or serviced by an unauthorized service provider, it's worth noting that Apple may decline to provide service for your device. The decision to refuse service will depend on the specific components that were affected by the unauthorized service.

Get a Genius Bar Reservation and Apple Support Options - Apple
Contact Genius Bar.
Manage Reservations - My Reservations - Apple
If you still need help, reset your Face ID, then set it up again. Go to Settings, tap Face ID & Passcode, then tap Reset Face ID. Next, tap Set up Face ID to set it up again.
If Face ID isn't working on your iPhone or iPad Pro

Parts and service history
With iPhone 12 models and later using iOS 15.2 and later, you can go to Settings > General > About to see the parts and service history of your iPhone and you can see if the camera has been replaced. If the repair was done using genuine Apple parts and processes, you will see "Genuine Apple Part" next to Camera.

This message doesn't affect your ability to use your iPhone or access your camera.
Learn more about iPhone parts and service history.

If your iPhone's camera has been previously replaced, repaired, or serviced by an unauthorized service provider, it's worth noting that Apple may decline to provide service for your device. The decision to refuse service will depend on the specific components that were affected by the unauthorized service.

Get a Genius Bar Reservation and Apple Support Options - Apple
Contact Genius Bar.
Manage Reservations - My Reservations - Apple
I have the same issue on my Iphone 11 pro since December when it updated to IOS 18, I have tried every suggestion on all the forums I have found so far and still now resolution.
Face ID is not working on iPhone