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Unlike the fingerprint sensor, facial recognition is somewhat problematic because, unlike fingerprints, our appearance can vary from day to day, and whether it's a three-day beard, glasses, hat, body jewelry, or other accessories, they can cause facial recognition to fail.

To counteract this we can add an alternative look.

Android 11 | One UI 3.0
Step 1: Tap on  Settings
Step 2: Tap on  Biometrics and security
Step 3: Tap on  Face recognition
Step 4: Enter the current  Pattern ,  PIN  or  Password
Step 5: Tap on  Add alternative look
Step 6: Tap on  Continue  and follow the instructions on screen
  1. Tap on Settings
  2. Tap on Biometrics and security
  3. Tap on Face recognition
  4. Enter the current Pattern, PIN or Password
  5. Tap on Add alternative look
  6. Tap on Continue and follow the instructions on screen
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Samsung Instructions