Face ID bug
I think I found a bug in my iPhone. My Face ID is also accessible to my twin brother . Even I have set it , my twin brother can also unlock my iPhone from my Face ID .
iPhone 11, iOS 14
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This is not a bug.. Face ID recognizes your facial features. A twin is clearly going to have quite similar facial features to yours
About Face ID advanced technology - Apple Support
If you are concerned about your twin brother being able to access your device, then use a passcode to unlock your phone instead of using Face ID