Why does local delivery on Shopify require an HS Tariff code?

[PhilB1]

Today, Shopify Shipping is not allowing me to ship locally. It won't allow me to ship within my city without a HS Tariff code. I've moved all my shipping to ClickShip. What kind of Quality Control testing do they do?

[BGOSHOP]

It's tedious but you can ship locally if you input the HS codes. I've had to do that on every one of my orders this afternoon.