There are some known restrictions that may limit Jetti being able to import tracking details from vendors.
Jetti stops checking for tracking details after 30 days. Orders older than this will need to be manually triggered. You can do this from the main purchases list:
Items which have been deleted in your store or the vendor's store since the order, cannot be updated and will need to be manually marked as shipped.
Note: If you're looking for information on importing tracking in Woocommerce, please review this article.