Unable to find cTID trader account with id=XXXXXX

Hello

I'm running a script to test Open API:

from ctrader_open_api import Client, Protobuf, TcpProtocol, Auth, EndPoints
from ctrader_open_api.messages.OpenApiCommonMessages_pb2 import *
from ctrader_open_api.messages.OpenApiMessages_pb2 import *
from ctrader_open_api.messages.OpenApiModelMessages_pb2 import *
from twisted.internet import reactor
import json
import datetime
import calendar

credentialsFile = open("credentials-dev.json")
credentials = json.load(credentialsFile)

host = EndPoints.PROTOBUF_LIVE_HOST if credentials["HostType"].lower() == "live" else EndPoints.PROTOBUF_DEMO_HOST
client = Client(host, EndPoints.PROTOBUF_PORT, TcpProtocol)

print(client)

symbolName = "EURUSD"
dailyBars = []

# We will use below method to transform the Open API trend bar to a tuple with bar open time, open price, high price, low price, and close price:
def transformTrendbar(trendbar):
    openTime = datetime.datetime.fromtimestamp(trendbar.utcTimestampInMinutes * 60, datetime.timezone.utc)
    openPrice = (trendbar.low + trendbar.deltaOpen) / 100000.0
    highPrice = (trendbar.low + trendbar.deltaHigh) / 100000.0
    lowPrice = trendbar.low / 100000.0
    closePrice = (trendbar.low + trendbar.deltaClose) / 100000.0
    return [openTime, openPrice, highPrice, lowPrice, closePrice, trendbar.volume]


def trendbarsResponseCallback(result):
    print("\nTrendbars received")
    trendbars = Protobuf.extract(result)
    barsData = list(map(transformTrendbar, trendbars.trendbar))
    global dailyBars
    dailyBars.clear()
    dailyBars.extend(barsData)
    print("\ndailyBars length:", len(dailyBars))
    print("\Stopping reactor...")
    reactor.stop()


def symbolsResponseCallback(result):
    print("\nSymbols received")
    symbols = Protobuf.extract(result)
    global symbolName
    symbolsFilterResult = list(filter(lambda symbol: symbol.symbolName == symbolName, symbols.symbol))
    if len(symbolsFilterResult) == 0:
        raise Exception(f"There is symbol that matches to your defined symbol name: {symbolName}")
    elif len(symbolsFilterResult) > 1:
        raise Exception(
            f"More than one symbol matched with your defined symbol name: {symbolName}, match result: {symbolsFilterResult}")
    symbol = symbolsFilterResult[0]
    request = ProtoOAGetTrendbarsReq()
    request.symbolId = symbol.symbolId
    request.ctidTraderAccountId = credentials["AccountId"]
    request.period = ProtoOATrendbarPeriod.D1
    # We set the from/to time stamps to 50 weeks, you can load more data by sending multiple requests
    # Please check the ProtoOAGetTrendbarsReq documentation for more detail
    request.fromTimestamp = int(
        calendar.timegm((datetime.datetime.utcnow() - datetime.timedelta(weeks=50)).utctimetuple())) * 1000
    request.toTimestamp = int(calendar.timegm(datetime.datetime.utcnow().utctimetuple())) * 1000
    deferred = client.send(request)
    deferred.addCallbacks(trendbarsResponseCallback, onError)


def accountAuthResponseCallback(result):
    print("\nAccount authenticated")
    request = ProtoOASymbolsListReq()
    request.ctidTraderAccountId = credentials["AccountId"]
    request.includeArchivedSymbols = False
    deferred = client.send(request)
    deferred.addCallbacks(symbolsResponseCallback, onError)


def applicationAuthResponseCallback(result):
    print("\nApplication authenticated")
    request = ProtoOAAccountAuthReq()
    request.ctidTraderAccountId = credentials["AccountId"]
    request.accessToken = credentials["AccessToken"]
    deferred = client.send(request)
    deferred.addCallbacks(accountAuthResponseCallback, onError)


def onError(client, failure):  # Call back for errors
    print("\nMessage Error: ", failure)


def disconnected(client, reason):  # Callback for client disconnection
    print("\nDisconnected: ", reason)


def onMessageReceived(client, message):  # Callback for receiving all messages
    if message.payloadType in [ProtoHeartbeatEvent().payloadType, ProtoOAAccountAuthRes().payloadType,
                               ProtoOAApplicationAuthRes().payloadType, ProtoOASymbolsListRes().payloadType,
                               ProtoOAGetTrendbarsRes().payloadType]:
        return
    print("\nMessage received: \n", Protobuf.extract(message))


def connected(client):  # Callback for client connection
    print("\nConnected")
    request = ProtoOAApplicationAuthReq()
    request.clientId = credentials["ClientId"]
    request.clientSecret = credentials["Secret"]
    deferred = client.send(request)
    deferred.addCallbacks(applicationAuthResponseCallback, onError)


# Setting optional client callbacks
client.setConnectedCallback(connected)
client.setDisconnectedCallback(disconnected)
client.setMessageReceivedCallback(onMessageReceived)

# Starting the client service
client.startService()
# Run Twisted reactor, we imported it earlier
reactor.run()

I've created credentials-dev.json

{
  "ClientId": "myClientId",
  "Secret": "mySecret",
  "AccountId": 601509,
  "AccessToken": "AccessTokenHere",
  "HostType": "live"
}

And then I'm getting an output with an error like this:

Connected

Application authenticated

Message received: 
 errorCode: "CH_CTID_TRADER_ACCOUNT_NOT_FOUND"
description: "Unable to find cTID trader account with id=601509"


Account authenticated

Message received: 
 ctidTraderAccountId: 601509
errorCode: "INVALID_REQUEST"
description: "Trading account is not authorized"


Symbols received
Unhandled error in Deferred:

Traceback (most recent call last):
  File "C:\Users\irmsc\OneDrive\pp\Backtimization2\venv\lib\site-packages\ctrader_open_api\factory.py", line 15, in received
    self.client._received(message)
  File "C:\Users\irmsc\OneDrive\pp\Backtimization2\venv\lib\site-packages\ctrader_open_api\client.py", line 46, in _received
    responseDeferred.callback(message)
  File "C:\Users\irmsc\OneDrive\pp\Backtimization2\venv\lib\site-packages\twisted\internet\defer.py", line 662, in callback
    self._startRunCallbacks(result)
  File "C:\Users\irmsc\OneDrive\pp\Backtimization2\venv\lib\site-packages\twisted\internet\defer.py", line 764, in _startRunCallbacks
    self._runCallbacks()
--- <exception caught here> ---
  File "C:\Users\irmsc\OneDrive\pp\Backtimization2\venv\lib\site-packages\twisted\internet\defer.py", line 858, in _runCallbacks
    current.result = callback(  # type: ignore[misc]
  File "C:/Users/irmsc/OneDrive/pp/Backtimization2/OpenAPI.py", line 47, in symbolsResponseCallback
    symbolsFilterResult = list(filter(lambda symbol: symbol.symbolName == symbolName, symbols.symbol))
builtins.AttributeError: symbol

I'm pretty sure I've added the right cTID (it's the 6 digit number, right?), but it's unable to find it for some strange reason.

What else perhaps have I've done wrong?

Thanks for your help! :)