高级群发预览成功但是接收不到图文消息？

{"touser":"oUtta5nUPIAESf4M3KNalP5dSUVQ","mpnews":{"media_id":"4D0xgmxx1UIo3ODZrOW5Zc9IHfpCzNLz1G5SdFisgLXMoIhdPSB4mQ6ROJYQaukE"},"msgtype":"mpnews"}

{"errcode":0,"errmsg":"preview success"}

接口地址https://api.weixin.qq.com/cgi-bin/message/mass/preview