If the code was displayed below the QR code, then you can use it add that account to your Google Authenticator again.
It's useful in case you lose your phone or it's damaged.
Thank you for the answer, but im not talking about the Secure private key is about the backup code. I have access to the account because the normal 2fa works with the phone correctly. The problem is that the code that is suppose to work as Back Up code to access the account without the phone does not work and this is disturbing. I dont know if im doing something wrong but this back up code is not accepted in Bittrex and Hitbtc(with different 2fa of course).