3 Disable “Require Attention for ID”

There’s a setting called Require Attention for ID that Face ID automatically enables when you first use your phone. This setting looks at your eyes to make sure that you are focusing on the phone before it will unlock. That sounds creepy, but it’s designed to prevent strangers from accessing your iPhone, such as someone using your face to unlock the phone when you are passed out or held against your will.

If that isn’t really a concern for you, you can head to Settings and disable this feature in the same spot where you enabled Alternate Appearance. This should make it easier for your phone to recognize you, especially if you are wearing sunglasses, etc.