Updating order status programmatically not sending emails

Hi there,

Very simply, I am running:

$order->update_status(‘completed’);

And it is updating the order status to completed, but not sending out the completed email to customers. When I manually set it to completed, it does. Please advise.

Have also tried:

$order->update_status(‘completed’,”,true);

and:

$order->update_status(‘completed’,”,true);
$order->save();

and:

$order->set_status(‘completed’);
$order->save();