Shade after using symposium sending custom pm via pm_handler doesnt seem to be working. It increases the number of PM's and sends the message, but those cannot be accessed.
require_once MYBB_ROOT . "inc/datahandlers/pm.php";
$pmhandler = new PMDataHandler();
$pmhandler->admin_override = true;
$pm = [ "subject" => 'test',
"message" => 'test',
"fromid" => -1,
"toid" => [1]
];
$pmhandler->set_data($pm);
if ($pmhandler->validate_pm()) {
$pmhandler->insert_pm();
echo 'PM sent';
}