Face ID quit working. I’ve reset but didn’t help. What next?
Face ID quit working. I reset but it didn’t help. What now? iPhone XR.
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Your Face ID true depth camera has probably failed.
Using diagnostics available in iOS 14.6 or later, Apple has detected an issue with your TrueDepth camera that might cause it to not function as expected. The TrueDepth camera contains lasers, which might be disabled for safety reasons if the device malfunctions or is damaged. This won't prevent you from using your iPhone or iPad, but until your iPhone or iPad is updated or serviced, you might not be able to use Face ID, Animoji, Memoji, and some other features that use the front camera.
If you get that message and can't enroll your face or unlock your device with Face ID, you can take your device to an Apple Store or Apple Authorized Service Provider, or contact Apple Support about your iPhone or your iPad. Apple Support
If you had the screen replaced other than by Apple it will never work again
See also If Face ID isn't working on your iPhone or iPad Pro - Apple Support