It is not possible to create COD shipments with every UPS account. A "Daily" or "Drop Ship" account is necessary for this. The account type "Occasional" is not supported by the UPS interface for the creation of COD shipments. If the message "The COD option is unavailable with the selected service, UPS account type, and/or with the shipments origin/destination" is displayed when creating COD shipments, this is probably the problem. Please contact your UPS Account Manager to have your account type changed.