We are trying to use SP API for accessing our own selling account. I am using a self authorized app. When trying to subscribe to MFN_ORDER_STATUS_CHANGE in our EU selling account I get the error: “Access to requested resource is denied.” Using the same code I can successfully subscribe and receive message from REPORT_PROCESSING_FINISHED and FBA_OUTBOUND_SHIPMENT_STATUS. Subscribing to MFN_ORDER_STATUS_CHANGE also succeeds using US seller account.
MFN_ORDER_STATUS_CHANGE requires PII access.