eBay

I try to publish my offers on the uk sandbox. When i create the fullfilment, return and payment policies i get this response: "Invalid policy ID. The seller profile ID is not valid"When i try to create again it says that the policy alread exists. but...

Hello, I have a lot of trouble to publish my offers. And got the error message i need a fullfilment policy id.i created a fullfilment policy and when i try to retrieve it with a GET request to:https://api.sandbox.ebay.com/sell/account/v1/fulfillment_...