Generally, replacing screen will not affect the normal use of Face ID. With our has done some further researches and guess the problem is caused by improper operations during the repair, which results in the damage of flex cables or other components. You can check the link to watch the video and know how we repair iPhone X face ID failure after changing screen.
Video link: https://www.rewa.tech/video-info/how-to-fix-iphone-x-face-id-failed-after-repairing.html
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REWA is a world leading electronics repair business solutions provider who was founded in 2008 in HongKong. We are committed to delivering one-stop services covering Sourcing Solution, Technical Support Solution as well as Recycle & Resell Solution.