Hi hfcheung,
Congratulations on your new iPhone and thanks for reaching out in Apple Support Communities. I understand you're having trouble using Face ID and you're seeing a message that it is unavailable and the camera seems to be zoomed in too far. I know how important the Face ID feature is; I'd like to help. First, if you haven't already, restart your iPhone and try to enroll in Face ID again. If the issue persists, work through the steps below and test Face ID after each:
Make sure that the TrueDepth camera on your iPhone or iPad isn't covered with a case or a screen protector. Also, check if there’s residue or dirt covering the TrueDepth camera.
If you're using an iPad in landscape orientation, make sure that your finger or palm isn't covering the TrueDepth camera. If it is, you might see an alert at the top of the screen that says "Camera covered" with an arrow pointing at the TrueDepth camera.
Face ID works on iPhone only when it's in portrait orientation and you’re facing the TrueDepth camera. On iPad, you can use Face ID when your iPad is in any orientation.
The TrueDepth camera has a similar range of view as when you take a selfie or make a FaceTime call. Whether your iPhone or iPad is lying on a surface or you're holding it in a natural position, make sure that your iPhone or iPad is an arm’s length or closer (10-20 inches) from your face.
If you still need help, reset Face ID, then set it up again. Go to Settings > Face ID & Passcode and tap Reset Face ID. Then tap Set up Face ID to set it up again.
If you can’t enroll your face, take your device to an Apple Retail Store or Apple Authorized Service Provider or contact Apple Support.
If Face ID isn't working on your iPhone or iPad Pro
Best Regards.
