使用python后台程序发送模板消息，代码如下

url = f'https://api.weixin.qq.com/cgi-bin/message/wxopen/template/send?access_token={access_token}'
params = {
    "touser": "oSyuJ4vOTcvx-xxxTv3mXSZ8F4GE",
    "template_id":"WLSiIt0f0H5WwNILmcf3gY9aADrhjQJ1pJWaHKmz0ZA",
    "data": {
        "first": {
            "value": "您的设备已触发温度报警"
            # "color": "#173177"
        }
        "keyword1": {
            "value": "1222032091"
            # "color": "#173177"
        },
        "keyword2": {
            "value": "温湿度恒温箱"
            # "color": "#173177"
        },
        "keyword3": {
            "value": "2021年06月07日 19:00:00"
            # "color": "#173177"
        },
        "keyword4": {
            "value": "温度超标 45°C"
            # "color": "#173177"
        },
        "remark": {
            "value": "2022-02-10 10:00:00"
            # "color": "#173177"
        }
        }

    # }
}
payl = json.dumps(params)
response = requests.post(url=url, json=payl)

response {"errcode":47001,"errmsg":"data format error rid: 620cb249-360cbce4-0dbdf1e4"}

提示格式错误。请帮助看一下问题在哪里。