There is a problem with the QR code or mobile phone network.

The QR code is relatively blurry and cannot be recognized by mobile phones, so it cannot be scanned. There is a problem with the mobile phone network and there is a delay. The above are all the reasons why my Nanjing online visa cannot be scanned out by scanning the QR code. Generally speaking, the reason why users of My Nanjing APP cannot use the "Scan" function is because the software is not given permission to use the camera. Since the camera cannot be turned on, scanning cannot be performed. Faced with this situation, we need to find the application management function in the mobile phone, then find My Nanjing, then enter the permission management function, set it to allow the camera to be turned on, and then use Scan.