If you're using an Android device, make sure that all developer options are switched off, including the USB error reporting. You can adjust this option in 'Developer options' in 'Settings'. Also, make sure that your device is not 'rooted'. If the operating system is an Android variant other than the one that was shipped with your device, then the Banqup ID app may not be installable because of security reasons.
If you are using iOS, your device must not be 'jailbroken'.
If the problem persists, please contact our service desk (via the contact button below) with information about the manufacturer and model of your device and the version of your device's operating system.