I have been trying to do a post request on this appstore api endpoint to be able to set availability on USA territory. However even after following the payload body I still get the error of no matching resource was included. Here is my payload: payload = { data: { attributes: { availableInNewTerritories: true }, relationships:{ app:{ data: { type: "apps", id: app_id } }, territoryAvailabilities: { data: [{ id: "#{territory_id}", type: "territoryAvailabilities" }] } }, type: "appAvailabilities" }, included: [{ id: "#{territory_id}", type: "territoryAvailabilities" }] } and this is the api error response I get: { "errors" : [ { "id" : "2c42b5cc-4.....", "status" : "409", "code" : "ENTITY_ERROR.RELATIONSHIP.INVALID", "title" : "The provided entity includes a relationship with an invalid value", "detail" : "The relationship 'territoryAvailabilities' expects an included resource with type 'territoryAvailabilities' and id 'USA' but no matching resource was included.", "source" : { "pointer" : "/included" } } ] } I am confused as to what the error was referring to as I added the included payload as array and the ids and type match with the territoryAvailabilities relationships as well.