Requires installation of another app that is NOT an Editor's Choice and is NOT a top developer. The qr code reader app that you must also install requires permissions to view your Contacts?! There are other qr code readers that only need the camera  but they don't work with Google Authenticator. Google needs to build in a QR code reader or use something else more reputable. The point of 2-step verification is increased security  but I feel I'm becoming less secure by installing the other app.
July 12 2016