My Face ID stopped working . I haven’t had any camera work done on it .

Hello ~ Click on below and work through the steps there…

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

If you are seeing an alert you may need to have your iPhone checked out…

Genius Bar Reservation and Apple Support Options - Apple

~Katana-San~

If Face ID isn’t working:

1: If Face ID isn't working on your iPhone or iPad Pro - Apple Support

2:If an alert says Face ID has been disabled on your iPhone or iPad Pro - Apple Support

You can also check this out if you see an alert that you may need your iPhone checked out:

Genius Bar Reservation and Apple Support Options - Apple