Face recognition missing after iPhone update

Try the instructions in the following guides to address the Face ID issues that you are having.

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

👉 If Face ID isn't working on your iPhone or iPad Pro - Apple Support

If the guides, above, do not help resolve the Face ID issues, then contact 👉 Official Apple Support OR you can always get your iPhone examined at the Apple Store 👉 Genius Bar Reservation and Apple Support Options or at an Authorized Service Center for further diagnosis and a resolution.

Axel F.

Barry ~ The long process of applying an iOS update to an old iPhone with a weak battery can be the proverbial "straw that broke the camel's back." So...

Does your iPhone 11 still have its original battery?

And what's the Maximum Capacity % here?...

Settings > Battery > Battery Health & Charging

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I started noticing this before the version 18 came out, as well, so I reset the phone on iTunes, or actually Apple Devices works better. iTunes is being phased out…It helped , however, has not fixed it completely. So I’m guessing this needed addresses in the developers feed back site. It would appear this bio feedback loop needs some special attention in coding?

Face ID not working on iPhone after iOS 1… - Apple Community