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There are three means you can use to log in:
Something you know: for example a PIN code or password
Something you have: for example a telephone number or identifier
Something you are: for example fingerprint or facial recognition
With two-factor authentication you always use two of these means to log in to an account. For example, a password and a code received by SMS.
If you can no longer use the authenticator app you have set up, for example because you have lost your phone,
then you can regain access to your account by using the recovery codes.
Therefore, it is important to keep the recovery codes in a safe place.
You'll get this option when you set up 2-factor authentication, but you can always download these recovery codes at a later time as long as you have access to your account.