since you don't know what it is then it means you don't have it, so don't worry about it.

2FA is an additional way of securing your account on blockchain.info which you have to enable separately inside the settings.

just go back to https://blockchain.info/wallet/#/login and log in your account using the "Wallet-ID" and "password"

if you have generated that address with your account there you are going to see it in your wallet and be able to spend from it.