My Face ID was disabled why

This Support article is specific to seeing a 'disabled' Face ID alert, and explains what to do when you see that notice or an issue with the TrueDepth camera. --> 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 and this one to get a repair estimate —> iPhone Repair & Service - Apple Support

This is generally a hardware issue. If the unit's on an OS version older than 16.7.2, you might be able to fix it by updating it from a computer or the Software Update function in Settings; otherwise, contact Apple Support.

(246957)