first take a pic of the qr code in your mobile camera and save the image file in secret area, (like mail) then scan via google authenticator app.
then if you missed the google authenticator you can use this image file for scanning the qr code.
be safe, thank you.
Forget about google authentication, if you lose your device then you are in deep shit!!! I moved to
Authy Desktop. It has recovery system - so, if you lose your device then you do not need to manually contact with all the customer services and ask them to remove your 2FA.
PS: My list is fairly long...