How to backup and restore Google Authenticator  

1.Find the Google Authenticator app on your old phone and follow these steps:

Click the menu in the upper-right corner, select "Export accounts," click "Continue," verify your phone password or Face ID, select the account(s) you want to transfer to your new phone, and then click "Export." A QR code will be displayed on the app.

2.Open the Google Authenticator app on your new phone and follow these steps:

Click the menu in the lower-right corner, select "Scan a QR code," click "Scan QR code," and then scan the QR code displayed on your old phone. The Google Authenticator app will be restored at this point.