Why aren't my orders being fulfilled on Etsy even after providing the tracking company?

Why aren't my orders being fulfilled on Etsy even after providing the tracking company?

To mark an order as fulfilled on Etsy, a Tracking Number is also required.

If you can ship orders without a Tracking Number, you must enable the relevant setting in the app. Once enabled, orders without a Tracking Number can be marked as fulfilled. 
Read the user guide for more clarity!