Zoho Calendar API Create Event - Returning "description": "eventdata missing."

I am trying to do a post and create a new event, it is returning "eventdata missing" and "Less_than_min_occurance" I have tried to delete the nested json inside of the first eventdata and still the same issue. Any insight?

eventdata = {
"eventdata": {
"dateandtime": {
"timezone": "Asia/Kolkata",
"start": "20240216",
"end": "20240216"
},
"title": "test invitation",
"attendees": [
{
"email": "user2@pavi1.com",
"status": "NEEDS-ACTION"
}
],
"conference": "zmeeting"
}
}
# Construct the full URL for the API request
api_endpoint = f"https://calendar.zoho.eu/api/v1/calendars/{CALENDAR_UID}/events"
# Set up the headers with the access token
headers = {
'Authorization': f'Bearer {ACCESS_TOKEN}',
'Content-Type': 'application/json'
}
# Make the POST request to the Zoho Calendar API
response = requests.post(api_endpoint, json=eventdata, headers=headers)