jQuery ajax method does not return data

I am sending email with phpmailer, I receive the emails when I press the "send" button, but I wanted to stay on the same HTML page, so I used AJAX script with HTML and PHP.
The problem is that I am not getting the JSON data back that I need to update my HTML page with the email status and PHP reponse, so :

• response_array status
• response_array message
• response_array success

Thank you for your help

AJAX IN HTML

<script>
        $("#form").submit(function(e) {
        e.preventDefault(); // prevent actual form submit
        var from_name_temp = $('#from_name').val();
        var from_email_temp = $('#from_email').val();
        var choix_gout_temp = $(".choix_gout:checked").val();
        $.ajax({
            type: "POST",
            url: "/mailer.php",
            data: "from_name="+from_name_temp+"&from_email="+from_email_temp+"&choix_gout="+choix_gout_temp,
            dataType: "json",
            complete: function(data) {
                    console.log("Thank you for subscribing!");
                    console.log(data);
                    console.log(data.status);
                    console.log(data.message);
                    console.log(data.success);
                }
        })
    });
</script>

PHP

<?php

$error = '';
$name = '';
$email = '';
$subject = '';
$message = '';

$from_email = '';
$from_name = '';
$choix_gout = '';
$response_array = array();

use PHPMailerPHPMailerPHPMailer;
use PHPMailerPHPMailerException;
    
function clean_text($string)
{
    $string = trim($string);
    $string = stripslashes($string);
    $string = htmlspecialchars($string);
    return $string;
}

 send($from_name, $from_email, $choix_gout); 

function  send($from_name, $from_email, $choix_gout){
        
    $error = '';
            
    $ot1 = $_POST['choix_gout'];
    $ot2 = $_POST['from_name'];
    $ot3 = $_POST['from_email'];
    
    echo($ot1);
    echo($ot2);
    echo($ot3);

    if(empty($ot2))
    {
        $error .= '<p><label class="text-danger">Please Enter your Name</label></p>';
        $name = '';
    }
    else
    {
        $name = clean_text($ot2);
        if(!preg_match("/^[a-zA-Z ]*$/",$name))
        {
            $error .= '<p><label class="text-danger">Only letters and white space allowed</label></p>';
        }
    }
    if(empty($ot3))
    {
        $error .= '<p><label class="text-danger">Please Enter your Email</label></p>';
        $email = '';
    }
    else
    {
        //$email = clean_text($_POST["from_email"]);
        $email = clean_text($ot3);
        if(!filter_var($email, FILTER_VALIDATE_EMAIL))
        {
            $error .= '<p><label class="text-danger">Invalid email format</label></p>';
        }
    }
    
    
    if($error == '')
    {
    
        require 'PHPMailer/src/Exception.php';          /* Exception class. */
        require 'PHPMailer/src/PHPMailer.php';          /* The main PHPMailer class. */
        require 'PHPMailer/src/SMTP.php';               /* SMTP class, needed if you want to use SMTP. */
        require 'PHPMailer/src/class.html2text.php';

        $mail = new PHPMailer();
        $mail->IsSMTP();
        $mail->SMTPDebug  = "1";
        $mail->Host       = "*****";
        $mail->Port       = "587";
        $mail->SMTPSecure = "tls";
        $mail->SMTPAuth   = "true";
        $mail->Username   = "*****";
        $mail->Password   = "*****";
        $mail->AddReplyTo("*****","****");
        $mail->From       = ("****");
        $mail->FromName   = ("***");
        $mail->AddAddress("*****,******");
        $mail->Subject  = "[GOUT] : " . $ot1 . ';' . $name . ';' . $email;
        $mail->IsHTML(true);
        $mail->Body = "
            <div style='width: 640px; font-family: Arial, Helvetica, sans-serif; font-size: 11px;'>
            </div>
        ";
        if(!$mail->Send()) {
            $message = 'Mail error: '.$mail->ErrorInfo;
            $response_array = array("success"=> false,
                                    "status" => false,
                                    "message" => $message);
            header('Content-Type: application/json');
            echo json_encode($response_array);die();
        } else {
            $message = "email sent";
            $response_array = array("success"=> true,
                                    "status" => true,
                                    "message" => $message);
            header('Content-Type: application/json');
            echo json_encode($response_array);die();
        }
    }
    else{
        $response_array = array("success"=> false,
                                "status" => false,
                                "message" => $error);
        header('Content-Type: application/json');
        echo json_encode($response_array);die();
    }?>