What just happened to my Face ID
What happened to my Face ID and why , i use my Face ID for everything
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We cannot really tell you what happened to it if you do not provide a description. Apple has several documents helping you with Face ID:
This document 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
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.