Face ID not working after update 17.2.1

Same problems for me on my 13 Pro. Solved it by going into Settings > Face ID & Passcode. But I had to try multiple times for the camera to recognize that my face was there (face went in and out of focus). Also, passcode for unlocking screen (should Face ID not work) is now 6 digits, instead of 4. Was still having problems activating Face ID on lock screen until, after reading a comment about screen protector, I wiped mine clean and was able to quickly enable that feature (seems even faster now). Perhaps the update has made the front and back lenses more sensitive to enable TrueDepth to function (it scans face with thousands of dots). Now, getting into my phone and apps is really quick. Good luck!

Update:

went to Apple Store and tested errors with screen protector but no error without screen protector. After changing it, everything going well.

Capncohen, Thank you very much. I cleaned the front camera, and I was able to set up my face ID on the first shot. I had been going crazy for two days after the 17.2.1 update caused my face ID to stop working.

Cleaning the phone front worked wonderfully for me! Thanks.

I went into Face ID & Attention settings and turned the three options off. It now works. Picture below

I wiped my phone and started fresh and it still isn’t working. I turned off WiFi and did it while I was out earlier today and it let me reset Face ID then once I connected to WiFi at home it stopped again. I went out and reset it and it worked. So Apple knows it’s a problem but it’s def with WiFi

I have had this problem as well. It usually starts working again after restarting my iPhone.

Hooray! I followed the suggestions here and cleaned the front of my iPhone. Presto! I finally was able to reset Face ID after two days of fails and frustration.

I had the same problem with my iPhone 13 Pro Max after updating to the latest version of iOS 17. I followed basic troubleshooting, but nothing worked. Then, I came across a weird solution. Although it's not a permanent fix, it does the job. So, whenever Face ID stops working, I have to tap the front camera notch/island. It will start working for a few hours, until you do the trick again.

I went to the Apple Store after dozen of tries on my own and spending 30 minutes with customer service who I allowed to log into my phone. They ran a diagnostic and found no errors. At the store they also ran a diagnostic test, twice. First time nothing second time…front camera hardware fail, battery diminished capacity. All in all $500 of repairs to fix. I believe this is a scam to generate sales. The front camera still takes selfies. Is there a second camera. This whole thing is bull.

iPhone 11 Pro max. No problem with Face ID. Got a message for update 17..2.1.

So I updated it (12 Jan 2024 16:20 Thailand).

After the update it say. A PROBLEM WAS DETECTED WITH THE TRUEDEPTH CAMERA. FACE ID HAS BEEN DISABLED.

Before the update no problem. Now all of a sudden there is a problem..

I just installed 17.3 today thinking that they would’ve fixed it and they didn’t and from what I’ve read on other pages people have been paying Apple over $200 to replace the true depth camera when it isn’t a bad camera it’s a glitch they caused with iOS 17.2.1

apple said to wipe the phone and start fresh and that’ll fix it. It didn’t. Still doesn’t work

same here 13 Pro, faceid didnt recognise me before i updated all of the sudden, i updated and it didnt recognise me either, i deleted my face id and tried making a new one, had the same issues you were explaining, got it eventually AND IT DIDNT recognise me AGAIN! deleted it a second time and now it wont even let me scan my face anymore. ffs

Check the version

and try to update it upward