Raised in behalf of user as he is getting this error though using the .NET library and so far he is having no problems. He has already installed version eikon-1.1.14.

Will share link to user for him to provide additional information.

Please see details below.

From Eikon API

[18]:

############# Eikon ###############

#https://developers.refinitiv.com/en/api-catalog/eikon/eikon-data-api/quick-start#quick-start-guide-for-windows

import eikon as ek 

ek.set_app_key('##### EIKON APP KEY #####')

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
~\AppData\Local\Temp/ipykernel_15876/3524143416.py in <module>
      2 #https://developers.refinitiv.com/en/api-catalog/eikon/eikon-data-api/quick-start#quick-start-guide-for-windows
      3 import eikon as ek
----> 4 ek.set_app_key('##### EIKON APP KEY #####')

~\anaconda3\envs\eikon\lib\site-packages\eikon\Profile.py in set_app_key(app_key)
     31     You can get an app key using the App Key Generator (this App is available in Eikon Desktop).
     32     """
---> 33     get_profile().set_app_key(app_key)
     34      35 
~\anaconda3\envs\eikon\lib\site-packages\eikon\Profile.py in set_app_key(self, app_key)
    221                 self._desktop_session._app_key = app_key  # = DesktopSession(app_key, self._on_state, self._on_event)
    222             else:
--> 223                 self._desktop_session = DesktopSession(app_key=app_key,
    224                                                        on_state= self._on_state,
    225                                                        on_event=self._on_event) 
~\anaconda3\envs\eikon\lib\site-packages\eikon\streaming_session\desktop_session.py in __init__(self, app_key, on_state, on_event, **kwargs)
     23      24     def __init__(self, app_key, on_state=None, on_event=None, **kwargs):
---> 25         super().__init__(app_key=app_key,
     26                          on_state=on_state,
     27                          on_event=on_event,

~\anaconda3\envs\eikon\lib\site-packages\eikon\streaming_session\session.py in __init__(self, app_key, on_state, on_event, token, dacs_user_name, dacs_position, dacs_application_id)
    216         self._timeout = 60
    217         timeout = httpx.Timeout(self._timeout)
--> 218         self._http_session = httpx.AsyncClient(
    219             headers={
                "Accept": "application/json"},
    220             timeout=timeout,

~\anaconda3\envs\eikon\lib\site-packages\httpx\_client.py in __init__(self, auth, params, headers, cookies, verify, cert, http1, http2, proxies, mounts, timeout, follow_redirects, limits, max_redirects, event_hooks, base_url, transport, app, trust_env)
   1378         proxy_map = self._get_proxy_map(proxies, allow_env_proxies)
   1379 -> 1380         self._transport = self._init_transport(
   1381             verify=verify,
   1382             cert=cert,

~\anaconda3\envs\eikon\lib\site-packages\httpx\_client.py in _init_transport(self, verify, cert, http1, http2, limits, transport, app, trust_env)
   1426             return ASGITransport(app=app)
   1427 -> 1428         return AsyncHTTPTransport(
   1429             verify=verify,
   1430             cert=cert,

~\anaconda3\envs\eikon\lib\site-packages\httpx\_transports\default.py in __init__(self, verify, cert, http1, http2, limits, trust_env, proxy, uds, local_address, retries)
    231     232         if proxy is None:
--> 233             self._pool = httpcore.AsyncConnectionPool(
    234                 ssl_context=ssl_context,
    235                 max_connections=limits.max_connections,

~\anaconda3\envs\eikon\lib\site-packages\httpcore\_async\connection_pool.py in __init__(self, ssl_context, max_connections, max_keepalive_connections, keepalive_expiry, http1, http2, retries, local_address, uds, network_backend)
    109         self._pool: List[AsyncConnectionInterface] = []
    110         self._requests: List[RequestStatus] = []
--> 111         self._pool_lock = AsyncLock()
    112         self._network_backend = (
    113             AutoBackend() if network_backend is None else network_backend 
~\anaconda3\envs\eikon\lib\site-packages\httpcore\_synchronization.py in __init__(self)
     10 class AsyncLock:
     11     def __init__(self) -> None:
---> 12         self._lock = anyio.Lock()