返回param invalid

[echogqq]

采用python 请求，代码如下
def getTest():
global access_token
if len(access_token) == 0:
access_token = getAccessToken()
TEST_URL = 'https://api.weixin.qq.com/customservice/msgrecord/getmsglist?access_token=' + access_token;
print(TEST_URL)
post = {
"query": "ff",
"city": "ff",
"category": "flight,hotel",
"appid": "wx*********",
"uid": "oki*************"
}
response = requests.post(TEST_URL, json = post)
print(response.text)
返回
{"errcode":65416,"errmsg":"param invalid, please check hint: [O.4SvA0207e567]"}
看不出参数哪里出错了，也不知道这个hint去哪里查看。