VIZpin is not paired with your phone like a Bluetooth speaker or carkit and will never require you to enter a PIN. Instead, all communication between your phone and VIZpin is done through the VIZpin SMART app.
Exit out of your device settings and open the VIZpin SMART app. Login and refresh the app by swiping down the center area. If you have been granted access you will see a Smartkey in your app with an open button. Once within Bluetooth range, the Open button will turn teal green and you can tap to unlock.