error on function call

I am seeing something strange here (or perhaps I am having a senior moment?) For some reason my call to 
passwordless_login_admin($email,$id);

is coming up with the error below. Can someone tell me what is going on? 

PHP Code:

Type: Error

Message: Call to undefined function passwordless_login_admin()

Filename: /app/application/controllers/Users_start_login.php 


PHP Code:

if ( ! defined('BASEPATH')) exit('No direct script access allowed');
require 'vendor/autoload.php';


class Users_start_login extends CI_Controller {

    function __construct() {
        parent::__construct();
        $this->load->library('form_validation');
        $this->load->library('session');
        $this->load->helper(array('form', 'url'));
 //       $this->load->database();
        $this->output->set_template('default3_passwordless');
        $this->_init();
    }

    private function _init()
    {
        $this->load->js('assets/themes/default/js/jquery-1.9.1.min.js');
        $this->load->js('assets/themes/default/hero_files/bootstrap-transition.js');
        $this->load->js('assets/themes/default/hero_files/bootstrap-collapse.js');
        //load up data needed for fa
        $_SESSION['apiKey'] = getenv('apiKey');
        $_SESSION['applicationID_survey'] = getenv('applicationID_survey');
        $_SESSION['applicationID_login'] = getenv('applicationID_login');
        $_SESSION['applicationID_admin_login'] = getenv('applicationID_admin_login');
        $_SESSION['applicationID_admin_register_login'] = getenv('applicationID_admin_register_login');  //this is for both register and login
        $_SESSION['emailTemplate'] = getenv('emailTemplate');
        $_SESSION['tenantID_survey'] = getenv('tenantID_survey');
        $_SESSION['tenantID_login'] = getenv('tenantID_login');

        $_SESSION['client'] = new FusionAuth\FusionAuthClient($_SESSION['apiKey'], "http://fusionauth:9011");
    }

    public function get_email()
    {
        $id=0;
        $email=html_escape($_POST['email']);
        passwordless_login_admin($email,$id);
    
        if (isset($email)) {
            if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
                $emailErr = "Invalid email format";
            }
        }
    }


    public function passwordless_login_admin($email,$id)
    {
        //start the passwordless
        ....

    } 


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