Don’t know what head or iPhone you have. That doesn’t work. Instead I see my iPhone shake a little indicating Face ID sign in failure.Works perfectly fine for me flat on a desk. I only need to move my face to about a 30º angle overhead before I see the unlock animation.
I literally have to move my phone every time I want to sign in. The only position that Face ID works on the desk for me is when the phone is sitting right in front of me, like where a keyboard is supposed to be.
Touch ID needs to come back BAD. Stupid of Apple to remove.