When I enabled two-step verification, they told me that the backup code is important:
Keep your backup code in a safe place! If you lose access to your phone, this backup code will be necessary to access your IFTTT account. For account security reasons, we will be unable to retrieve your backup codes for you.
But IFTTT doesn't seem to have written anything on how to actually use the backup code to access your account.
Now, I have lost my old phone and can't use Google Authenticator to login to the IFTTT app on my new phone (iPhone 7) as the Authenticator data doesn't seem to have been saved in the iCloud backup I used to restore my phone.
I have my password as well as my backup code. This ought to be enough. But without proper instructions I am at a loss.