PHPMailer et invitation Outlook

Bonjour à tous,

Je suis bloqué sur un sujet depuis quelques temps. Je me lance enfin à poser une nouvelle discussion.
En effet, j'aimerai via PHPMailer ou autre, envoyer une invitation Outlook (demande de rendez vous) à une adresse mail précise.
je vous montre mon code qui est le fruit de ma recherche sur le net et l'erreur que le navigateur m'affiche pour l'instant.

Merci d'avance à tous :)

Code:

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<?php
// Import PHPMailer classes into the global namespace
// These must be at the top of your script, not inside a function
use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\Exception;
 
//Load composer's autoloader
require 'PHPMailer/vendor/autoload.php';
 
$event_id = 1234;
$sequence = 0;
$status = 'TENTATIVE';
 
 
 
    //event params 
$summuary = $_POST['summuary'];
$venue = $_POST['lieu'];
$start = $_POST['date_debut'];
$start_time = $_POST['heur_debut'];
$end = $_POST['date_fin'];
$end_time = $_POST['heur_fin'];
$description = $_POST['description'];
 
$destinataire = $_POST['emailEvent'];
 
$mail = new PHPMailer(true);      
 
    //Server settings
    $mail->SMTPDebug = 0;                                 // Enable verbose debug output
    $mail->isSMTP();                                      // Set mailer to use SMTP
    $mail->Host = 'ssl0.ovh.net';  // Specify main and backup SMTP servers
    $mail->SMTPAuth = true;                               // Enable SMTP authentication
    $mail->Username = '*******';                 // SMTP username
    $mail->Password = '******';                           // SMTP password
    $mail->SMTPSecure = 'tls';                            // Enable TLS encryption, `ssl` also accepted
    $mail->Port = 587;                                    // TCP port to connect to
 
    //Recipients
    $mail->setFrom('*********', 'test event');
    $mail->addAddress($destinataire, 'Toi');     // Add a recipient
    $mail->ContentType = 'text/calendar';
 
    //Content
    $mail->isHTML(false);                                  // Set email format to HTML
    $mail->Subject = 'Outlook event';
    $mail->addCustomHeader('MIME-version',"1.0");
    $mail->addCustomHeader('Content-type',"text/calendar; method=REQUEST; charset=UTF-8");
    $mail->addCustomHeader('Content-Transfer-Encoding',"7bit");
    $mail->addCustomHeader('X-Mailer',"Microsoft Office Outlook 12.0");
    $mail->addCustomHeader("Content-class: urn:content-classes:calendar");
 
    $ical = "BEGIN:VCALENDAR\r\n";
    $ical .= "VERSION:2.0\r\n";
    $ical .= "PRODID:-//YourCassavaLtd//EateriesDept//EN\r\n";
    $ical .= "METHOD:REQUEST\r\n";
    $ical .= "BEGIN:VEVENT\r\n";
    $ical .= "ORGANIZER;SENT-BY=\"MAILTO:organizer@kaserver.com\":MAILTO:onbehalfoforganizer@kaserver.com\r\n";
    $ical .= "ATTENDEE;CN=them@kaserver.com;ROLE=REQ-PARTICIPANT;PARTSTAT=ACCEPTED;RSVP=TRUE:mailto:organizer@kaserver.com\r\n";
    $ical .= "UID:".strtoupper(md5($event_id))."-kaserver.com\r\n";
    $ical .= "SEQUENCE:".$sequence."\r\n";
    $ical .= "STATUS:".$status."\r\n";
    $ical .= "DTSTAMPTZID=Africa/Nairobi:".date('Ymd').'T'.date('His')."\r\n";
    $ical .= "DTSTART:".$start."T".$start_time."\r\n";
    $ical .= "DTEND:".$end."T".$end_time."\r\n";
    $ical .= "LOCATION:".$venue."\r\n";
    $ical .= "SUMMARY:".$summuary."\r\n";
    $ical .= "DESCRIPTION:" str_replace("\r\n", "\\n", $description);
    $ical .= "BEGIN:VALARM\r\n";
    $ical .= "TRIGGER:-PT15M\r\n";
    $ical .= "ACTION:DISPLAY\r\n";
    $ical .= "DESCRIPTION:Reminder\r\n";
    $ical .= "END:VALARM\r\n";
    $ical .= "END:VEVENT\r\n";
    $ical .= "END:VCALENDAR\r\n";
 
    $mail->Body = $ical;
 
   //send the message, check for errors
    if(!$mail->send()) {
    $this->error = "Mailer Error: " . $mail->ErrorInfo;
    return false;
    } else {
    $this->error = "Message sent!";
    return true;

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