Where can I find USPS Ground Advantage tracking numbers for my orders?

[HigherHuman]

Hey I usually always use USPS Ground Advantage when I ship orders. We had a video go viral on tik tok and we have over 2,000 orders shipped out in two days. I have had a few customers asking me about tracking numbers  USPS website says that ground advantage does come with tracking but the label I get from Shopify do not have tacking numbers on them.

I have tried entering every number on the label but none of them are a tracking number. Is there a solution to finding the tracking number? Or is this a feature Shopify does not have yet for USPS Ground Advantage?