Did I break face ID?

Customer came in with an iphone 11 screen that was cracked topside and in restore mode. There was a lot of dirt/dust/etc on 1 of the selfie cameras and dot projector. I replaced the screen and updated the iOS and the phone worked. I tested face ID but it wouldn’t let me set it up. It says that I have to try again later or that my face is out of view and I need to reposition it. Portrait mode says I need to move further away. Proximity sensor and auto brightness works when I tested calling someone. I called the customer and asked if face ID worked and she said yes what I don’t really believe. If I am correct the dot projector is broken, but I did not remove the selfie cam.

Is it possible that unlocking works but setting up a new face ID fails or if it’s broken, nothing will work.

I have replaced a lot of iPhones with faceID and have never broken one before. Is this the first time?