Mainly for the following destination countries, the "State/Province" of the shipping address is required.
- United States of America
- People's Republic of China
Also, if a state code exists, the carrier systems usually require the code, not the actual state name. You might see an error stating such as "The state name is too long" after entering the state name as it is. In this case the label creation is blocked and you need to check and input the corresponding state code.