Home Assistant REST传感器无状态值问题排查求助

我尝试从某API获取数据，已通过Postman测试该API，返回的数据结构如下（已移除无关值，仅保留结构）：

{
    "data": {
        "api_token": "fd3b6366e28fdc77e8c12fe8ff2a7425",
    },
    "devices": [
        {
            "did": "KlkvwRNNnJNQC4bEnE1uSf",
        }
    ],
    "message": "Authorization Successful!"
}

随后我在/homeassistant/configuration.yaml中进行了如下配置：

rest:
  - resource: "https://MYURL/login"
    scan_interval: 172000
    method: POST
    headers:
      Content-Type: application/json
    payload: '{
      email: "MYEMAIL@gmail.com",
      password: "MYPASS"
    }'
    
    sensor:
      - unique_id: 22c32b5b-8c0c-4995-8a38-2838f78ac147
        name: "hottub_login_api"
        value_template: "{{ value_json }}"

          
      - unique_id: ba9f0dcb-6c49-47c6-b6d1-c4a0c9900a32
        name: "hottub_login_did"
        value_template: "{{ value_json }}"

在开发者工具中查看传感器时，发现其无状态值。此前我还尝试过以下几种配置，但传感器始终处于unavailable状态：

配置1 #

sensor:
  - unique_id: 22c32b5b-8c0c-4995-8a38-2838f78ac147
    name: "hottub_login_api"
    value_template: "{{ value_json['data']['api_token'] }}"

配置2 #

sensor:
  - unique_id: 22c32b5b-8c0c-4995-8a38-2838f78ac147
    name: "hottub_login_api"
    value_template: "{{ value_json.data.api_token }}"

配置3 #

sensor:
  - unique_id: 22c32b5b-8c0c-4995-8a38-2838f78ac147
    name: "hottub_login_api"
    value_template: "{{ value_json }}"
    json_attributes_path: "$.data"
    json_attributes:
      - api_token

请求协助排查：

• 我的初始REST配置是否存在问题？
• POST请求是否遗漏了内容？
• 如何调试该POST请求？
• 或是我还有其他操作错误？

内容的提问来源于stack exchange，提问作者cyborgv7