3 days ago ¡ Make sure that Face ID is set up and that the features you're trying to use Face ID with are turned on. Check that nothing is covering the TrueDepth camera Remove anything that might be covering the TrueDepth camera like a smudge, case, or screen protector.
Past 30 Days: 205. All Time: 25,034. Face ID will only work if apple does a screen replacement on the phone. Chances are the flex for the FaceID sensor module is torn and will cause it to not work. Replacing it will not fix the problem as it requires apple to pair the part with the board which sucks. - iPhone XS Max.

See this, If Face ID isn't working on your iPhone or iPad Pro - Apple Support, follow those steps, and if it doesn't work, follow Step 7 and contact Apple Support. Mine doesn’t even open up to the camera option.

If you replace iPhone 8, 8 plus or X screen you need to copy the firmware data of the original screen into the new screen. The needed tool is under development. I saw some working versions, what are tested and working with IOS 11.4 and 12.0 Beta. The screen data can be cloned only to OEM screens for now. Afte the copy of the data, the light
Most commonly when there's a Face ID failure following a screen replacement, it's generally due to damage to a flex cable on either the dot projector, the IR camera or the front-facing camera. If it's the front camera, that's actually replaceable as it's not paired to the logic board, but it'll take some Dremel work on the metal housing.
By default, Face ID doesn’t work if anything is covering your mouth and nose. If you’re wearing a face mask and have already set up Face ID with a Mask *, make sure your eyes aren’t blocked. You may need to hold your iPhone higher if you’re wearing a face mask.
Posted: Feb 22, 2021. Options. The Face ID and earpiece assembly is paired to each iPhone, if replaced it will never work again. You need the original one from the original screen transferred over to the new display, then it will work again. If the original one is damaged, then you just have to live without that feature. BNM5PF3.
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    • iphone 11 face id not working after screen replacement