How could it be repaired

Hello,

See below links,

>If Face ID isn't working on your iPhone or iPad Pro – Apple Support (AU)

or

> If an alert says Face ID has been disabled on your iPhone or iPad Pro - Apple Support

if nothing of the above works, try and do a factory rest or restart your iPhone. Also make sure you have the latest IOS update on your phone. If it still does not work it will be a hardware issue causing the problem and you will have to take it in to An Apple Store or certified Apple Service Centre and they will help you from there.

Good Luck, yam97

Hello there!

See this article:

If Face ID isn't working on your iPhone or iPad Pro

Or~~

If an alert says Face ID has been disabled on your iPhone or iPad Pro

Thank you for your reply!

Click on this sentence If Face ID isn't working on your iPhone or iPad Pro and follow the steps in the article