face id has stopped working and now won't let me reset it.
I have an iPhone 11 Pro with iOS 13.6. Face ID used to work great, but it recently became intermittent, i.e., would often require entering passcode. So I tried to reset Face ID in settings. Now when I try to set up Face ID from scratch, it says, "Get Started." But then it says Face ID not available, or it says wait until the phone warms up and then try again. The phone is inside in normal temperature. I've rebooted a couple of times. Nothing seems to work. I'm not wearing a mask, the camera is not covered, etc. The front camera works well enough to take a selfie at least.
Has anyone had this problem? Any recommendations?
iPhone 11 Pro