Woo ET Force Attendee Regeneration

functions.php

<?php

//add Order action
add_filter( 'woocommerce_order_actions', 'rt_add_regenerate_action_for_et' );

function rt_add_regenerate_action_for_et( $actions ) {
	$actions['tribe_force_regenerate_ticket'] = __( 'Regenerate Attendees' );

	return $actions;
}

add_action( 'woocommerce_order_action_tribe_force_regenerate_ticket', 'rt_regenerate_tickets_by_order' );

/**
 * Regenerate action for missing attendees
 *
 * @param $order WC_Order
 */
function rt_regenerate_tickets_by_order( $order ) {
	tribe( 'tickets-plus.commerce.woo' )->generate_tickets( $order->get_id() );

	$order->add_order_note('Force regenerated attendees');
}

Adds a new action to force regenerate attendees if they are not showing in the attendee list.

For the orders where the generate attendees is not showing up you can force regenerate them for the Order edit screen:

http://p.tri.be/TBQ3dh