It has to do with polarization of the lenses and the "Require attention" feature of FaceID. The notch cameras can't determine if your eyes are looking at the ca

It has to do with polarization of the lenses and the "Require attention" feature of FaceID. The notch cameras can't determine if your eyes are looking at the camera if you're wearing polarized sunglasses (depending on the type of polarization) so having that setting on will give you a 100% failure rate with something that's covering your eyes.