Cara, como em um passe de mágica e varios encadeamentos de foruns e soluções, após meses consegui o bendito envio para ambos os destinatários, muito obrigado pela tentativa! vou deixar aqui caso alguem mais precise.

"<?php
require 'PHPMailer/src/Exception.php';
require 'PHPMailer/src/PHPMailer.php';
require 'PHPMailer/src/SMTP.php';

use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\SMTP;
use PHPMailer\PHPMailer\Exception;

$mail = new PHPMailer(true);

try {
//Server settings
mail->SMTPDebug = SMTP::DEBUG_SERVER; mail->isSMTP();
mail->Host = 'smtpout.secureserver.net'; mail->SMTPAuth = true;
mail->SMTPAutoTLS = true; mail->Port = 80;
mail->Username = '[email protected]'; mail->Password = 'SenhaEmail';

//Recipients
mail->setFrom('[email protected]', 'Mailer'); mail->addAddress('[email protected]', 'XYZTABC');
mail->addAddress('[email protected]', 'XYZTABC'); //Content mail->isHTML(true);
mail->Subject = 'Here is the subject'; mail->Body = 'This is the HTML message body in bold!';
$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 "<pre>"; print_r(e);
echo "Message could not be sent. Mailer Error: {$mail->ErrorInfo}";
}
?>"