Germanized tracking shortcode

Hi Lavender,
I’m not sure I understood correctly how to create a shortcode for the shipment tracking ID in the Germanized plugin. The table is called “3ece_woocommerce_gzd_shipments”. The meta key seems to be “shipment_tracking_id”. Following your guide (https://villatheme.com/knowledge-base/how-to-include-shipment-tracking-numbers-in-message-templates/), I assumed the correct shortcode that I can insert into the email template customizer plugin text field was [wec_order_meta key=”_shipment_tracking_id”]. But that did not work. Can you tell me what I did wrong?