Pls how can my Face ID work ?

Hello,

Apple has several documents helping you with Face ID which uses the TrueDepth camera.

This Support article is specific to seeing a 'disabled' Face ID alert, and explains what to do when you see that notice. --> If an alert says Face ID has been disabled on your iPhone or iPad Pro - Apple Support

Unless a software update solves the problem you may need to have Apple take a look at your device. Use this link to set up an appointment —> Genius Bar Reservation and Apple Support Options - Apple

If you don't see a 'disabled' message but do have general issues with Face ID not working properly, explore the list of things to try in this document: If Face ID isn't working on your iPhone or iPad Pro - Apple Support

If the first 8 don't solve the issue then use #9, contact Apple.

Hi

I would try resetting Face ID.

You can do this via: Settings > Face ID & Passcode > Reset Face ID

Hope this helps!