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Among other things, face recognition cannot work in dark environments because there is not enough light for reliable recognition, and starting with ColorOS 7 there is an "Auto brighten screen for Face unlock" feature that can help with this.

Android 11 | ColorOS 11.0
Step 1: Tap on  Settings
Step 2: Tap on  Password & biometrics
Step 3: Tap on  Face
Step 4: Enable or disable  Auto brighten screen for face recognition
  1. Tap on Settings
  2. Tap on Password & biometrics
  3. Tap on Face
  4. Enable or disable Auto brighten screen for face recognition
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Oppo Instructions
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