Face ID Not Working [Fixed. Please see the approved answer for details.]

I’m not assuming it only happens to those who reset settings but that’s the vast majority of cases reported here. I’ve asked on several of Apple’s own forums and never got any replies except one person who stated he had never seen the issue. I do believe there is something specifically causing the issue. But even on the App Store reviews the only ones mentioning the issue also mentioned that settings were reset. I think it’s safe to say that it’s not a widespread problem. I had hesitated using 8, still have 7 on my iPad, until I got some feedback in those other forums. Until your post I haven’t seen any here that didn’t mention the reset. So I went ahead and installed it on my phone with no such issues with Face ID.