I have tried printing a UPS shipping label and am seeing an error returned:
121211: The requested accessory option is unavailable between the selected locations
The error means that one of the selected service options cannot be used for the destination country, for example the 'Commercial Invoice Removal', or the 'Signature Required' in the Delivery Confirmation Type. Please review all selected options via Shipping > Integrations > UPS > Services > Edit and disable those that may not be supported.
if there are several values available (Delivery Confirmation Type), please try choosing a different value and printing once more: