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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
How to Turn On/Off Screen illumination for Face recognition - Tap on  Settings
How to Turn On/Off Screen illumination for Face recognition - Tap on  Password & biometrics
How to Turn On/Off Screen illumination for Face recognition - Tap on  Face
How to Turn On/Off Screen illumination for Face recognition - 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

Oppo Instructions
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