Notification from Shopify:
CCS (Carrier Calculated Shipping) needs to be enabled in a store. This comes default with the advanced Shopify plan. If a store is not on this plan, it needs to be enabled through the Shopify support desk (upon request from the account owner) for an additional: $20USD a month. Another option is if the account owner changes the subscription invoice from monthly to annual- not only will they enable CCS free of charge per year but they’ll also get 10% off their subscription cost.