无法在eBay沙箱发布报价及Fulfillment策略相关问题求助

问题1：发布报价时持续报错 #

尝试发布报价时，收到如下错误：

The eBay listing associated with the inventory item, or the unpublished offer has invalid data in the associated Fulfillment policy. Specify at least one valid shipping service.

已确认关联的Fulfillment policy已配置shipping service，且此前功能正常，仅近期出现该异常。

问题2：获取已创建的Fulfillment policy返回系统错误 #

调用接口获取已创建的Fulfillment policy时，返回系统错误：

{
    "errors": [
        {
            "errorId": 20500,
            "domain": "API_ACCOUNT",
            "category": "APPLICATION",
            "message": "System error."
        }
    ]
}

问题3：单个Fulfillment policy无法更新/删除 #

仅一个Fulfillment policy能返回成功响应，但无法对其进行更新或删除操作。使用以下请求体尝试更新时，返回空错误数组，但未产生实际变更：

更新请求体 #

{
    "categoryTypes": [
        {
            "name": "ALL_EXCLUDING_MOTORS_VEHICLES"
        }
    ],
    "handlingTime": {
        "unit": "DAY",
        "value": 3
    },
    "localPickup": false,
    "marketplaceId": "EBAY_DE",
    "name": "standardversand",
    "shippingOptions": [
        {
            "costType": "FLAT_RATE",
            "insuranceFee": {
                "currency": "EUR",
                "value": "0.00"
            },
            "insuranceOffered": false,
            "optionType": "DOMESTIC",
            "packageHandlingCost": {
                "currency": "EUR",
                "value": "0.00"
            },
            "shippingServices": [
                {
                    "buyerResponsibleForShipping": false,
                    "freeShipping": false,
                    "shippingCarrierCode": "DHL",
                    "shippingServiceCode": "DE_DHLPaket",
                    "shippingCost": {
                        "currency": "EUR",
                        "value": "5.90"
                    },
                    "shippingService": "DE_DHLPaket"
                }
            ]
        }
    ]
}

更新响应 #

{
    "errors": []
}

期望能正常发布报价，但尝试删除、获取及修改Fulfillment policy均无法解决问题，特此求助。

内容的提问来源于stack exchange，提问作者j.tudan