Use AssociateSoftwareToken with an Amazon SDK or CLI

    /// <summary>
    /// Get an MFA token to authenticate the user with the authenticator.
    /// </summary>
    /// <param name="session">The session name.</param>
    /// <returns>The session name.</returns>
    public async Task<string> AssociateSoftwareTokenAsync(string session)
    {
        var softwareTokenRequest = new AssociateSoftwareTokenRequest
        {
            Session = session,
        };

        var tokenResponse = await _cognitoService.AssociateSoftwareTokenAsync(softwareTokenRequest);
        var secretCode = tokenResponse.SecretCode;

        Console.WriteLine($"Use the following secret code to set up the authenticator: {secretCode}");

        return tokenResponse.Session;
    }

        Aws::Client::ClientConfiguration clientConfig;
        // Optional: Set to the AWS Region (overrides config file).
        // clientConfig.region = "us-east-1";

    Aws::CognitoIdentityProvider::CognitoIdentityProviderClient client(clientConfig);

        Aws::CognitoIdentityProvider::Model::AssociateSoftwareTokenRequest request;
        request.SetSession(session);

        Aws::CognitoIdentityProvider::Model::AssociateSoftwareTokenOutcome outcome =
                client.AssociateSoftwareToken(request);

        if (outcome.IsSuccess()) {
            std::cout
                    << "Enter this setup key into an authenticator app, for example Google Authenticator."
                    << std::endl;
            std::cout << "Setup key: " << outcome.GetResult().GetSecretCode()
                      << std::endl;
#ifdef USING_QR
            printAsterisksLine();
            std::cout << "\nOr scan the QR code in the file '" << QR_CODE_PATH << "."
                      << std::endl;

            saveQRCode(std::string("otpauth://totp/") + userName + "?secret=" +
                       outcome.GetResult().GetSecretCode());
#endif // USING_QR
            session = outcome.GetResult().GetSession();
        }
        else {
            std::cerr << "Error with CognitoIdentityProvider::AssociateSoftwareToken. "
                      << outcome.GetError().GetMessage()
                      << std::endl;
            return false;
        }

To generate a secret key for an MFA authenticator app

The following associate-software-token example generates a TOTP private key for a user who has signed in and received an access token. The resulting private key can be manually entered into an authenticator app, or applications can render it as a QR code that the user can scan.

aws cognito-idp associate-software-token \
    --access-token eyJra456defEXAMPLE

Output:

{
    "SecretCode": "QWERTYUIOP123456EXAMPLE"
}

For more information, see TOTP software token MFA in the Amazon Cognito Developer Guide.

    public static String getSecretForAppMFA(CognitoIdentityProviderClient identityProviderClient, String session) {
        AssociateSoftwareTokenRequest softwareTokenRequest = AssociateSoftwareTokenRequest.builder()
                .session(session)
                .build();

        AssociateSoftwareTokenResponse tokenResponse = identityProviderClient
                .associateSoftwareToken(softwareTokenRequest);
        String secretCode = tokenResponse.secretCode();
        System.out.println("Enter this token into Google Authenticator");
        System.out.println(secretCode);
        return tokenResponse.session();
    }

const associateSoftwareToken = (session) => {
  const client = new CognitoIdentityProviderClient({});
  const command = new AssociateSoftwareTokenCommand({
    Session: session,
  });

  return client.send(command);
};

suspend fun getSecretForAppMFA(sessionVal: String?): String? {
    val softwareTokenRequest =
        AssociateSoftwareTokenRequest {
            session = sessionVal
        }

    CognitoIdentityProviderClient { region = "us-east-1" }.use { identityProviderClient ->
        val tokenResponse = identityProviderClient.associateSoftwareToken(softwareTokenRequest)
        val secretCode = tokenResponse.secretCode
        println("Enter this token into Google Authenticator")
        println(secretCode)
        return tokenResponse.session
    }
}

class CognitoIdentityProviderWrapper:
    """Encapsulates Amazon Cognito actions"""

    def __init__(self, cognito_idp_client, user_pool_id, client_id, client_secret=None):
        """
        :param cognito_idp_client: A Boto3 Amazon Cognito Identity Provider client.
        :param user_pool_id: The ID of an existing Amazon Cognito user pool.
        :param client_id: The ID of a client application registered with the user pool.
        :param client_secret: The client secret, if the client has a secret.
        """
        self.cognito_idp_client = cognito_idp_client
        self.user_pool_id = user_pool_id
        self.client_id = client_id
        self.client_secret = client_secret


    def get_mfa_secret(self, session):
        """
        Gets a token that can be used to associate an MFA application with the user.

        :param session: Session information returned from a previous call to initiate
                        authentication.
        :return: An MFA token that can be used to set up an MFA application.
        """
        try:
            response = self.cognito_idp_client.associate_software_token(Session=session)
        except ClientError as err:
            logger.error(
                "Couldn't get MFA secret. Here's why: %s: %s",
                err.response["Error"]["Code"],
                err.response["Error"]["Message"],
            )
            raise
        else:
            response.pop("ResponseMetadata", None)
            return response