推送api

{
    "platform":"all",
    "audience":{
        "registration_id" : ["1a0018970ba2820f7fd"]
    },
    "notification":{"alert":"Hi,JPush!"},
    "options": {
        "third_party_channel": {
            "huawei":{
                "category": "DEVICE_REMINDER"
            }
        }
    },
}

请问推送请求体这样写报错400是什么问题