Face ID opens with 2 faces
Hi dear my sister’s iphone x open with two face. She can open her iphone x whit her face ande her boy can do it. I can send a clip of this fail. I guess it has a bug unfortunately.
FACE ID failing
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It's not guaranteed to only open with her face : About Face ID advanced technology - Apple Support
The probability that a random person in the population could look at your iPhone X or later and unlock it using Face ID is approximately 1 in 1,000,000 (versus 1 in 50,000 for Touch ID). As an additional protection, Face ID allows only five unsuccessful match attempts before a passcode is required. The statistical probability is different for twins and siblings that look like you and among children under the age of 13, because their distinct facial features may not have fully developed. If you're concerned about this, we recommend using a passcode to authenticate.