PHP Mailer Unable to send

I am trying to use PHPMailer in cpanel, but with this code it sends me a error code 500, and I am not sure where to find additional information about this error.

<?php
    require("./class.phpmailer.php");

    $own = new PHPMailer();
    $own->IsSMTP();
    $own->SMTPDebug = 1;
    $own->SMTPAuth = true;
    $own->SMTPSecure = 'none';
    $own->Host = "smtp-relay.sendinblue.com";
    $own->Port = 587;
    $own->IsHTML(true);
    $own->SetLanguage("en", "phpmailer/language");
    $own->CharSet  ="utf-8";
    $own->Username = "foo@bar.com";
    $own->Password = "foobar";
    $own->SetFrom("foo@bar.com", "foo bar");

    $own->AddAddress("bar@foo.com");
    
    $own->Subject = "Test";
    $own->Body = "Welcome";
    if(!$own->Send()){
        echo "Mailer Error: ".$own->ErrorInfo;
        $status = 2;
    } 
    else {
        $status = 1;
    }
?>