Envoi de mail en PHP

<?php
use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\Exception;
//Load composer's autoloader
require 'vendor/autoload.php';
$mail = new PHPMailer(true);                              // Passing `true` enables exceptions
try {
    //Server settings
    $mail->SMTPDebug = 2;                                 // Enable verbose debug output
    $mail->isSMTP();                                      // Set mailer to use SMTP
    $mail->Host = 'smtp.office365.com';  // Specify main and backup SMTP servers
    $mail->SMTPAuth = true;                               // Enable SMTP authentication
    $mail->Username = 'Mon email';                 // SMTP username
    $mail->Password = '*******!';                           // SMTP password
    //$mail->SMTPSecure = 'tls';                            // Enable TLS encryption, `ssl` also accepted
    //$mail->SMTPSecure = 'ssl';
    $mail->SMTPSecure = 'starttls';
    $mail->Port = 587;                                    // TCP port to connect to
    
    //Recipients
    $mail->setFrom('info@moi.com', 'Moi');
    $mail->addAddress('contact@gmail.com', 'Lui');     // Add a recipient
    $mail->addAddress('info@domaine.com');               // Name is optional
    //$mail->addReplyTo('info@example.com', 'Information');
    //$mail->addCC('cc@example.com');
    //$mail->addBCC('bcc@example.com');
    //Attachments
    //$mail->addAttachment('/var/tmp/file.tar.gz');         // Add attachments
    //$mail->addAttachment('/tmp/image.jpg', 'new.jpg');    // Optional name
    //Content
    $mail->isHTML(true);                                  // Set email format to HTML
    $mail->Subject = 'Pour tester mes messages';
    $mail->Body    = 'Mon petit sa vas?? <br> Suis à la ligne <b>Cool<b>';
    //$mail->AltBody = 'This is the body in plain text for non-HTML mail clients';
    $mail->send();
    echo 'Message has been sent';
} catch (Exception $e) {
    echo 'Erreur.';
    echo 'Mailer Error: ' . $mail->ErrorInfo;
}

2019-05-28 04:49:11 SMTP ERROR: Failed to connect to server: An attempt was made to access a socket in a way forbidden by its access permissions. (10013)
SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting
Erreur.Mailer Error: SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting