Error 403 - Service accounts cannot invite attendees without Domain-Wide Delegation of Authority , but i'm added domain-wide not working

[engineerknow]

i'm added domain-wide not working

I have done all steps of the documentation,
Can Create normal Event, but can't addAttendee email

public function create_calendar()
{
$event = new Event;

    $event->name = 'A new event';
    $event->startDateTime = Carbon::now();
    $event->endDateTime = Carbon::now()->addHour();
    $event->addAttendee([
        'email' => '[email protected]',
        'name' => 'xxx',
        'comment' => 'Lorum ipsum',
    ]);
    $event->save();
}