Usually, Shopify shipping confirmation notification doesn’t include ship tracking number. You can easily add tracking to display in the email.

Step 1: Go to settings > Notifications > Shipping: Shipping Confirmation
Step 2: Open the template and look for the suitable area where you would like to display the tracking number
Step 3: Add this object: {{fulfillment.tracking_numbers}}
Step 4: Test by previewing it and modify according to your need.

That’s all. You can also add Shipping company by using object: {{fulfillment.tracking_company}} and list of tracking URLs by using object {{fulfillment.tracking_urls}}