Trying to send image to a user:

{

    "touser":"oyans5xvC4MbMe36HMzjpSPQFNw4",

    "msgtype":"image",

    "image":

    {

         "media_id":"uRKZkDkWtsvyO4fz0cp0KKt_Yzexs9g2S9PZFLT3iNKbRoObADrChTD845TaNtrI"

    }

}

Response is:

{"errcode":45162,"errmsg":"invalid type hint: [bX1RwA05898641]"}

Same works when using sandbox account. Please help.