I posted his in another thread but from memory I beleive this is caused my using the new blocks version of the Checkout page.
I had to revert back to the Classic version the Checkout page which is annoying as the new blocks version much nicer.
This is likely due to the Printful plugin only supporting 8.2.2 which tbh is not good enough :/
-
This reply was modified 8 months ago by jaceborg.