While creating USPS labels, you may sometimes run into this error
Endicia error 11301: 'Unable to retrieve Domestic label number: Invalid services selected for the transaction: Could not find sequence number for the given set of parameters. See request XML. Error encountered (Log ID: 46807)
USPS does not offer Delivery Confirmation options to all countries. If you receive this error when trying to ship Internationally and Delivery Confirmation, Signature Required, Adult Signature Required, or Adult Signature Restricted Delivery is selected, please select the “No Delivery Confirmation” from the drop-down menu in the Advanced Options section. For more details see this article.