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 10 (One UI 2.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Biometrics and security
Step 3:  Tap on  Face recognition
Step 4:  Enter  PIN / Pattern / Password
Step 5:  Tap on  Add alternative look
Step 6:  Tap on  Continue
  1. Open the Settings
  2. Tap on Biometrics and security
  3. Tap on Face recognition
  4. Enter PIN/Pattern/Password
  5. Tap on Add alternative look
  6. Tap on Continue

Samsung Instructions
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