Shipping information not pulling into template

We use WooCommerce Shipment Tracking to hold tracking numbers that are generated by a third party (off-site) service. When the tracking number comes in, the order status switches to Completed and sends the Order Complete email to the customer.

1. When I try to use the shortcode for tracking number within a text element ([wec_order_meta key=”_wc_shipment_tracking_items” array_key=”tracking_number”]), the email will not send at all, nor will the template preview buttons work.

2. When I try to use the placeholder information in a text element ({{order-_wc_shipment_tracking_items:tracking_number}}), it just displays the placedholder text, not the information.

3. No orientation of WC_Hook displays any information at all.