Object has no attribute 'get_all' when calling calendar.get_schedule.post()

I'm currently trying to get a room schedule through this code:

credential = ClientSecretCredential(
    config['tenantID'],
    config['clientID'],
    config['clientSecret']
)
scopes = ['https://graph.microsoft.com/.default']
client = GraphServiceClient(credentials=credential, scopes=scopes)

# GET /users/{id | userPrincipalName}
async def get_rooms():
    
    request_body = GetSchedulePostRequestBody(
        schedules = [
            "StanzaA@qq7h.onmicrosoft.com"
        ],
        start_time = DateTimeTimeZone(
            date_time = "2023-03-15T09:00:00",
            time_zone = "Pacific Standard Time",
        ),
        end_time = DateTimeTimeZone(
            date_time = "2023-12-15T18:00:00",
            time_zone = "Pacific Standard Time",
        ),
        availability_view_interval = 60,
    )

    request_configuration = GetScheduleRequestBuilder.GetScheduleRequestBuilderPostRequestConfiguration(
    headers = {
            'Prefer' : "outlook.timezone=\"Pacific Standard Time\"",
    }

    )

    result = await client.me.calendar.get_schedule.post(request_body, request_configuration = request_configuration)


    if result:
        print(result.value)

asyncio.run(get_rooms())

But when running I get an error coming from kiota

Traceback (most recent call last):
  File "C:\Users\Massimo Mendozza\Documents\GitHub\DynamicsToJoan\main.py", line 52, in <module>
    asyncio.run(get_rooms())
  File "C:\Users\Massimo Mendozza\AppData\Local\Programs\Python\Python311\Lib\asyncio\runners.py", line 190, in run
    return runner.run(main)
           ^^^^^^^^^^^^^^^^
  File "C:\Users\Massimo Mendozza\AppData\Local\Programs\Python\Python311\Lib\asyncio\runners.py", line 118, in run
    return self._loop.run_until_complete(task)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Massimo Mendozza\AppData\Local\Programs\Python\Python311\Lib\asyncio\base_events.py", line 650, in run_until_complete
    return future.result()
           ^^^^^^^^^^^^^^^
  File "C:\Users\Massimo Mendozza\Documents\GitHub\DynamicsToJoan\main.py", line 46, in get_rooms
    result = await client.me.calendar.get_schedule.post(request_body, request_configuration = request_configuration)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Massimo Mendozza\Documents\GitHub\DynamicsToJoan\Lib\site-packages\msgraph\generated\users\item\calendar\get_schedule\get_schedule_request_builder.py", line 40, in post
    request_info = self.to_post_request_information(
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Massimo Mendozza\Documents\GitHub\DynamicsToJoan\Lib\site-packages\msgraph\generated\users\item\calendar\get_schedule\get_schedule_request_builder.py", line 66, in to_post_request_information        
    request_info.headers.add_all(request_configuration.headers)
  File "C:\Users\Massimo Mendozza\Documents\GitHub\DynamicsToJoan\Lib\site-packages\kiota_abstractions\headers_collection.py", line 83, in add_all
    for key, values in headers.get_all().items():
                       ^^^^^^^^^^^^^^^
AttributeError: 'dict' object has no attribute 'get_all'

I'm currently running under this pyvenv:

home = C:\Users\Massimo Mendozza\AppData\Local\Programs\Python\Python311
include-system-site-packages = false
version = 3.11.0
executable = C:\Users\Massimo Mendozza\AppData\Local\Programs\Python\Python311\python.exe
command = C:\Users\Massimo Mendozza\AppData\Local\Programs\Python\Python311\python.exe -m venv C:\Users\Massimo Mendozza\Documents\GitHub\DynamicsToJoan

And this are my packages version:

Package                              Version
------------------------------------ ---------
aiohttp                              3.8.6
aiosignal                            1.3.1
anyio                                4.0.0
async-timeout                        4.0.3
attrs                                23.1.0
azure-core                           1.29.5
azure-identity                       1.15.0
certifi                              2023.7.22
cffi                                 1.16.0
charset-normalizer                   3.3.2
cryptography                         41.0.5
Deprecated                           1.2.14
frozenlist                           1.4.0
h11                                  0.14.0
h2                                   4.1.0
hpack                                4.0.0
httpcore                             0.18.0
httpx                                0.25.0
hyperframe                           6.0.1
idna                                 3.4
importlib-metadata                   6.8.0
microsoft-kiota-abstractions         1.0.0
microsoft-kiota-authentication-azure 1.0.0
microsoft-kiota-http                 1.0.0
microsoft-kiota-serialization-json   1.0.0
microsoft-kiota-serialization-text   1.0.0
msal                                 1.24.1
msal-extensions                      1.0.0
msgraph-core                         1.0.0a4
msgraph-sdk                          1.0.0
multidict                            6.0.4
opentelemetry-api                    1.20.0
opentelemetry-sdk                    1.20.0
opentelemetry-semantic-conventions   0.41b0
pendulum                             2.1.2
pip                                  22.3
portalocker                          2.8.2
pycparser                            2.21
PyJWT                                2.8.0
python-dateutil                      2.8.2
python-dotenv                        1.0.0
pytzdata                             2020.1
pywin32                              306
requests                             2.31.0
setuptools                           65.5.0
six                                  1.16.0
sniffio                              1.3.0
std-uritemplate                      0.0.46
typing_extensions                    4.8.0
urllib3                              2.0.7
wrapt                                1.15.0
yarl                                 1.9.2
zipp                                 3.17.0

Bắt đầu với cấu hình request và việc xử lý headers trong get_schedule_request_builder.py được tạo ra trong traceback, sau đó đọc kiota_abstractions/headers_collection.py, nơi get_all() được gọi. Kiểm tra loại header mà cấu hình request mong đợi và so sánh với dict được sử dụng trong ví dụ. Được xem là hoàn tất khi request được báo cáo không còn lỗi tại headers.add_all và hành vi header mong đợi đã được xác minh.