I have the same problem. I know my username and my password, but not the verification code. Not even the 8-digit backup code. All I can do is create a new account and use that one instead. I can't even log in with it on my mobile app.
if you lost access to the device with the authenticator and also to the backup codes for the 2nd factor authentication then I'm afraid you have lost access to your account.
If you have a smart TV with Android and is talking about Opera for Android, please post in the Opera for Android following the instructions available there.