I have tried printing a FedEx shipping label and am seeing an error returned:

2033: Customs Value is required.


Please review if the order is going to an international destination, but has a domestic service assigned to it. If this is the case, assign an International service to the order and that should resolve the error.

Additionally, each order item on an international order needs to have an unit price assigned to it. You can check the prices via > Orders > Open Orders screen > right-click on the order and then go to View > View Order and check the Items tab. Edit the order to change the prices if they are 0.