I tried many times to save the tracking codes updated on checkout page. But it’s always failed.
Hello! I’m sorry I cannot help you with this specific issue, but if you keep having errors with your current tracking system, I suggest you check out Trackr App. This app will let you create a separate tracking page on your store where customers can easily see their shipment status. Currently, the app can track more than 900 carriers globally so you can have peace of mind that your customers will be able to track their parcels.
Moreover, you will be able to send out shipping updates via email that will keep customers in the loop throughout the whole shipping process.