when I tried setting up face id and passcode I keep getting a message say "face id unavailable try again later. what can I do about this
I'M having trouble setting up fade id and passcode
iPhone 11, iOS 14
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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
iPhone parts and service history – Apple Support (UK)
See also If Face ID isn't working on your iPhone or iPad Pro - Apple Support