无法使用Python通过MS Graph API访问待办任务中的自定义列值

import requests
from msal import PublicClientApplication

# 配置 MSAL 客户端
app = PublicClientApplication(
    client_id="your_client_id",
    authority="https://login.microsoftonline.com/your_tenant_id"
)

# 获取访问令牌
result = app.acquire_token_by_client_credential(
    scopes=["https://graph.microsoft.com/.default"]
)
access_token = result["access_token"]

# 设置请求头
headers = {
    "Authorization": f"Bearer {access_token}",
    "Content-Type": "application/json"
}

# 获取待办任务
url = "https://graph.microsoft.com/v1.0/me/todo/lists"
response = requests.get(url, headers=headers)
lists = response.json()["value"]

# 获取特定列表中的待办任务
list_id = lists[0]["id"]
tasks_url = f"https://graph.microsoft.com/v1.0/me/todo/lists/{list_id}/tasks"
response = requests.get(tasks_url, headers=headers)
tasks = response.json()["value"]

# 获取待办任务中的自定义列值
for task in tasks:
    custom_columns_url = f"https://graph.microsoft.com/v1.0/me/todo/lists/{list_id}/tasks/{task['id']}/custom"
    response = requests.get(custom_columns_url, headers=headers)
    custom_columns = response.json()
    print(custom_columns)