企业微信创建群发任务

https://qyapi.weixin.qq.com/cgi-bin/externalcontact/add_msg_template?access_token=ACCESS_TOKEN

提交参数:

{
    "chat_type": "group",
    "sender": "158******17",
    "external_userid": [
        "wr1r0qCAAALqU**VNtTYtPc2sS*****",
        "wr1r0qCAAAp***V2Ej9OhZzXQ*****"
    ],
    "content": {
        "miniprogram": {
            "title": "邀请您对我们本周服务评价",
            "pic_media_id": "3omdpSvs-Au0RzD8TjroZKp_VOIK****YLve_QZ_1s*******",
            "appid": "wxf8******59f8",
            "page": "/pages/ev***ate"
        }
    },
    "sendtime": 1609932058
}

返回内容

chat sender missing, hint: [1609931209_154_ba1883e4***3539604456ff12fc], from ip: ****, more info at https://open.work.weixin.qq.com/devtool/query?e=86213

当不传 external_userid 时可以正常提交

请问这是什么原因?

不能做指定群发送吗?