Google authenticator qr code. If you already set up google authenticator for your account remove that account from authenticator. Go to security checkup and then on the 2 step verification you will see one item that has the add phone when u click u will see a qr code displayed that u scan with the app and then input the key. Learn more about backup codes.
Before you remove that account from authenticator make sure you have a backup. Use the same qr code or secret key on each of. The solution is a qr code generator.
To set up 2 step verification for the authenticator app follow the steps on screen. This tool allows you to easily generate qr codes for your accounts as long as you have the secret key without having to disable and re enable 2 factor authentication on each account. Visit the page on your desktop and type the name user and secret key then point your mobile device at your monitor to scan the code into google authenticator or whatever app youre using to generate the six digit codes.
Just fill in the fields then point your camera to the screen and boom your account is added.