IoT Core TLS certificates for DynamoDB access with the C++ SDK?

We have an embedded Linux device using IoT Core and authenticating using the files created with the aws iot create-keys-and-certificate CLI command. Now, we need to read data from DynamoDB in the same program. Because we already have these certificates on board, I was trying to use them to authenticate for DynamoDB, but am not having much success. We cane stablish our IoT Core connection like this:

    // Create the MQTT builder and populate it with connection parameters
    auto clientConfigBuilder =
        Aws::Iot::MqttClientConnectionConfigBuilder(connectionParameters.certificateFilepath.c_str(),
                                                    connectionParameters.privateKeyFilepath.c_str());
    clientConfigBuilder.WithEndpoint(connectionParameters.endpoint);
    clientConfigBuilder.WithCertificateAuthority(connectionParameters.rootCertificateFilepath.c_str());

    // Create the MQTT connection from the MQTT builder
    Aws::Iot::MqttClientConnectionConfig clientConfig = clientConfigBuilder.Build();
    Aws::Iot::MqttClient client = Aws::Iot::MqttClient();
    m_connection = client.NewConnection(clientConfig);

I was trying to do the same thing using

    Aws::Client::ClientConfiguration clientConfig;
    Aws::DynamoDB::DynamoDBClient dynamoClient(clientConfig);

but, the only related member that I see the ClientConfiguration class has is caPath/caFile.

What approach should I take here? I haven't found the documentation particularly helpful. We like how the IoT Core authentication works allowing us to easily provision devices with their own access and the ability to revoke access for any particular device. Is there a similar authentication method that will work for all services supported by the C++ SDK?