Ensure the “Intruder Selfie” feature is activated. Verify your device has a front camera and relevant permissions have been granted. Check if any other apps are currently using the camera. Verify the error times set for the “Intruder Selfie” feature are correct. Ensure ample storage space is available. Ensure the system version is 6.0 or above. Ensure the floating window permission is active. Note: Some systems like Oppo and Vivo might not work.