使用"联系[我]"功能，发送新客户欢迎语时，一部分客户发送成功了，一部分客户发送失败了，请问是什么原因？发送的欢迎语都是一样的

发送失败的消息内容体：{"welcome_code":"QZfVPyI8EohNnJiMlHVI1bIwYFcupFFNoHl_SEptkQ4","text":{"content":"hello\uff01\u6b22\u8fce\u6765\u5230\u300c\u829d\u58eb\u6d3e\u300d\ud83d\ude1d\n\n\u6211\u4eec\u4f1a\u5728\u516c\u4f17\u53f7\u5b66\u4e60\uff0c\u5f00\u8bfe\u524d\u4f1a\u62c9\u4f60\u8fdb\u7fa4\u54e6\uff5e\n\n\u2728\u4e3a\u4fdd\u8bc1\u987a\u5229\u5b66\u4e60\uff0c\u52a1\u5fc5\u6233\u94fe\u63a5\u7b7e\u5230\u5165\u5b66\nhttp:\/\/slink.baicizhan.com\/MRVnya"}}

返回结果：{  "errcode": 40063,"errmsg": "some parameters are empty, hint: [1591937095_61_c6a0320f2ca0382d5c8e78bc1361e5a0], from ip: 120.26.47.85, more info at https://open.work.weixin.qq.com/devtool/query?e=40063"}

发送成功的消息内容体：{"welcome_code":"UHFpEzIHgYu8Oman9V2Vgxn-GQMhr6QNaU1YvZckOhQ","text":{"content":"hello\uff01\u6b22\u8fce\u6765\u5230\u300c\u829d\u58eb\u6d3e\u300d\ud83d\ude1d\n\n\u6211\u4eec\u4f1a\u5728\u516c\u4f17\u53f7\u5b66\u4e60\uff0c\u5f00\u8bfe\u524d\u4f1a\u62c9\u4f60\u8fdb\u7fa4\u54e6\uff5e\n\n\u2728\u4e3a\u4fdd\u8bc1\u987a\u5229\u5b66\u4e60\uff0c\u52a1\u5fc5\u6233\u94fe\u63a5\u7b7e\u5230\u5165\u5b66\nhttp:\/\/slink.baicizhan.com\/MRVnya"}}

返回结果：{"errcode":0,"errmsg":"ok"}