A. 1. Ensure good lighting: Make sure the QR code is well-lit and not obscured. 2. Hold the camera steady: Keep your device steady while scanning to ensure the camera can focus on the QR code.

B. 3. Clean the camera lens: Sometimes, a dirty lens can affect scanning. Wipe the lens gently with a soft cloth. 4. Try a different scanning app: If the built-in scanner fails, consider using a third-party QR code scanner app.