Troubleshooting iPhone X Face ID Not Working 'Move iPhone a Little Lower/Higher'

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Observe The Dot Projector

At the Portrait Mode, there is no flashing red light from the Dot Projector.
We can confirm now that the Dot Projector has malfunctioned.
This is the fault and the problem cannot be fixed.
The three parts ( infrared camera, flood illuminator and dot projector) are paired to the phone. Damage of any one of them can cause Face ID failure and such an issue is irreparable.

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