A result of water exposure
My iPhone has been dropped in the water and , The face ID has become disabled
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You should set up your phone for service:
It can occur that you will receive the following message on your iPhone or iPad Pro : " A problem was detected with the true depth camera, FaceID is disabled"
When you're getting this error message, Make sure that you're iPhone or iPad Pro is running the latest version of iOS or iPadOS. If your device is running the latest iOS or iPadOS and you're still getting this message and FaceID is not working: contact Apple Support to get your device serviced.