@eyeintheskyswdrone: If you've set up a lock screen with Face Recognition, your Galaxy S21 may request your PIN every 24 hours for security purposes, as the feature is considered to be a 'low' security option. It may also request your PIN if 4 hours have passed since using the device, or if the phone has been restarted. If you find that the feature isn't recognising you, please ensure that there is plenty of light in the scene, and you remove any accessories such as hats and glasses. To improve the accuracy of the feature, head to Settings > Biometrics and security > Face Recognition > Add alternative look, and follow the on screen prompts.
