Hi!
I'm sorry I cannot help you with Shopify tracking, but if you are looking for a reliable trakcking app, take a look at Trackr. The app can track more than 900 carriers worldwide and what is special about it is that you can create a separate tracking page on your store, where your customers can easily track their orders.
The app also enables customers to turn on shipping update notifications (which are totally customizable to fit right in with your brand).
The pricing starts from 4$ a month (including 15 day free trial) and the support is very fast and responsive if you need any assistance.
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