I'm having the same issue, any updates on this? "data": { "type": "subscriptionPromotionalOffers", "attributes": { "name": "Tier2 50% off", "offerCode": "appoffTest01", "duration": "ONE_WEEK", "offerMode": "PAY_AS_YOU_GO", "numberOfPeriods": 1 }, "relationships": { "subscription": { "data": { "type": "subscriptions", "id": "6751863227" } }, "prices": { "data": [ { "type": "subscriptionPromotionalOfferPrices", "id": "1701cff0-c38d-4460-9845-43601292edbd" } ] } } }, "included": [ { "type": "subscriptionPromotionalOfferPrices", "id": "1701cff0-c38d-4460-9845-43601292edbd", "relationships": { "subscriptionPricePoint": { "data": { "type": "subscriptionPricePoints", "id": "eyJzIjoiNjc1MTg2MzIyNyIsInQiOiJBRkciLCJwIjoiMTAxMzIifQ" } } } } ] } "errors": [ { "id": "659be9c5-3a02-4a78-bf51-e40bf5c96138", "status": "409", "code": "ENTITY_ERROR.INCLUDED.INVALID_ID", "title": "The provided entity id is invalid", "detail": "The provided included entity id '1701cff0-c38d-4460-9845-43601292edbd' has invalid format", "source": { "pointer": "/included/0/id" } } ] }