Create an event with conference using python and Google Calendar API creates the event but not the conference

I am trying to create an event using Google Calendar API in Python 3. I also want to generate a Google Meet conference link for the event. I am using the documentations provided here:

• https://developers.google.com/calendar/quickstart/python
• https://developers.google.com/calendar/v3/reference/events#conferenceData
• https://developers.google.com/calendar/create-events

The event is created without a problem. However, it is missing the conference link. My code so far is as follows:

from pathlib import Path
from pickle import load
from pickle import dump
from google.auth.transport.requests import Request
from google_auth_oauthlib.flow import InstalledAppFlow
from googleapiclient.discovery import build
from uuid import uuid4
from typing import Dict, List
from oauth2client import file, client, tools


class EventPlanner:

    def __init__(self, guests: Dict[str, str], schedule: Dict[str, str]):
        guests = [{"email": email} for email in guests.values()]
        service = self._authorize()
        self.event_states = self._plan_event(guests, schedule, service)

    @staticmethod
    def _authorize():
        scopes = ["https://www.googleapis.com/auth/calendar"]
        credentials = None
        token_file = Path("./calendar_creds/token.pickle")

        if token_file.exists():
            with open(token_file, "rb") as token:
                credentials = load(token)

        if not credentials or not credentials.valid:
            if credentials and credentials.expired and credentials.refresh_token:
                credentials.refresh(Request())
            else:
                flow = InstalledAppFlow.from_client_secrets_file('calendar_creds/credentials.json', scopes)
                credentials = flow.run_local_server(port=0)
            with open(token_file, "wb") as token:
                dump(credentials, token)

        calendar_service = build("calendar", "v3", credentials=credentials)

        return calendar_service

    @staticmethod
    def _plan_event(attendees: List[Dict[str, str]], event_time, service: build):
        event = {"summary": "test meeting",
                 "start": {"dateTime": event_time["start"]},
                 "end": {"dateTime": event_time["end"]},
                 "attendees": attendees,
                 "conferenceData": {"createRequest": {"requestId": f"{uuid4().hex}",
                                                      "conferenceSolutionKey": {"type": "hangoutsMeet"}}},
                 "reminders": {"useDefault": True}
                 }
        event = service.events().insert(calendarId="primary", sendNotifications=True, body=event, conferenceDataVersion=1).execute()

        return event


if __name__ == "__main__":
    plan = EventPlanner({"test_guest": "test.guest@gmail.com"}, {"start": "2020-07-31T16:00:00",
                                                                          "end": "2020-07-31T16:30:00"})
    print(plan.event_states)

I suspect that the problem is with where I have passed conferenceDataVersion but the docs are not exactly clear about where it has to be passed other than that it must be passed. I also tried putting it in the body of the event or in createRequest. It always creates the event but not the conference. Unfortunately, I could not find anything about this online anywhere. Maybe I'm actually that bad at searching, but I have been testing different things and searching for a solution for several days! If anyone knows what I am missing, I will truly appreciate their assistance.