First of all, double check that you are using the correct App for this model. For this model you should be using InSightHD App. If you are using other Apps, the QR code cannot be recognized by the monitor.
Place the Phone's QR code in front of the Monitor's lens at 5cm and then slowly move away up to 20cm. This should make the scan successful, repeat if necessary.
For Apple devices, if Assistive Touch is enabled, make sure the on-screen button is not overlapping with the QR code.
If the scanning of QR code fail, try resetting the monitor:
If the QR code is still not recognized by the monitor after trying the above steps, contact consumer care (Contact Page) for further assistance.
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