Recently, many users stated in Apple's official forum that after their Face ID on the iPhone X is damaged, the rear camera of the mobile phone will stop working. Now the latest official maintenance document given by Apple has explained this problem.
In the documentation, Apple specifically stated this issue. If your iPhone X Face ID doesn't work and needs to be repaired, then the rear camera can't be used normally because the two are connected together.
Specifically, the iPhone X Face ID is linked to the rear telephoto lens. After the general face recognition is damaged, the official maintenance personnel will repair it through the rear camera. If the face-up camera cannot be successfully tried, then it will be changed. New.