"Insufficient permissions" on google calendar api's acl.list - google-api

Question

I'm getting Insufficient permissions when trying to call the acl.list method of the google calendar api via python.
service.acl().list(calendarId='primary').execute();
*** HttpError: <HttpError 403 when requesting https://www.googleapis.com/calendar/v3/calendars/primary/acl?alt=json returned "Insufficient Permission">
I'm using the scope 'https://www.googleapis.com/auth/calendar' as recommended in the documentation. Additionally, other API methods do work, for example service.calendarList
service.calendarList().list(pageToken=page_token).execute()
What am I missing?
Here is the code I'm using based almost entirely on the sample they provide:
import sys
from oauth2client import client
from googleapiclient import sample_tools
def main(argv):
# Authenticate and construct service.
# import pdb;pdb.set_trace()
service, flags = sample_tools.init(
argv, 'calendar', 'v3', __doc__, __file__,
# scope='https://www.googleapis.com/auth/calendar.readonly')
scope='https://www.googleapis.com/auth/calendar')
try:
page_token = None
while True:
calendar_list = service.calendarList().list(pageToken=page_token).execute()
for calendar_list_entry in calendar_list['items']:
print calendar_list_entry['summary']
page_token = calendar_list.get('nextPageToken')
service.acl().list(calendarId='primary').execute();
if not page_token:
break
except client.AccessTokenRefreshError:
print ('The credentials have been revoked or expired, please re-run'
'the application to re-authorize.')
if __name__ == '__main__':
main(sys.argv)

Answer 1

You might have to delete existing credentials, in the form of .json files. I had a similar "Insufficient permissions" problem, and I had to delete stored credentials. I had the additional problem that because of trying out some of Google's scripts in their tutorials, unknowingly I had credentials stored in a hidden .credentials folder in my home directory (users/home). Since they were hidden, I had to look for them through Terminal (on Mac), and delete them there. Once deleted, the problem was solved, since I could create new and proper credentials, suitable for the scope of my new script.

Answer 2

Something is wrong with your authentication. Insufficent permissions means that you don't have access.
I can verify that the scope https://www.googleapis.com/auth/calendar is enough to display ACL.list on the primary calendar.

Answer 3

You have to find the location of "calendar-dotnet-quickstart.json" file and delete it. I used .NET example and I have to debug the following code the find exact location.
string credPath = System.Environment.GetFolderPath(
System.Environment.SpecialFolder.Personal);
credPath = Path.Combine(credPath, ".credentials/calendar-dotnet-quickstart.json");
Then change scope as bellow and rebuild the solution.
string[] scopes = { CalendarService.Scope.Calendar};
You will notice that google will ask to confirm the access again.