After installing IOS 16.5.1, I cannot use face ID

Hello Enteng19,

This page can help provide some steps that may be able to resolve your issue with Face ID not working: If Face ID isn't working on your iPhone or iPad Pro - Apple Support

The page will have more info on each step, but it will cover the following:

1. Check for updates

2. Check your Face ID settings

3. Check that nothing is covering the TrueDepth camera

4. Make sure that your face isn't blocked

5. Make sure that you're facing the TrueDepth camera

6. Restart your device

7. Add an alternate appearance

8. Reset Face ID

9. Get service

If you see an error that Face ID has been disabled, which would appear at the top of Settings > Face ID & Passcode, then this page will have the appropriate steps to follow: If an alert says Face ID has been disabled on your iPhone or iPad Pro - Apple Support

What to do next

1. Update your iPhone or iPad to the latest version of iOS or iPadOS.

2. Check if there is an issue with Face ID in your iPhone's parts and service history. To do this, open the Settings app, tap General, then tap About.

3. If you still can't enroll your face or unlock your device with Face ID, you can take your device to an Apple Store or Apple Authorized Service Provider, or contact Apple Support about your iPhone or your iPad.

Cheers.