Why is Google Calendar API (oauth2) responding with 'Insufficient Permission'?

Question

I\'m doing a get request to the following URL (with {id} replaced with the id from the web interface):

https://www.googleapis.com/calendar/v3/calendars/{id}
         


        

Answer 1

To fix, I revoked access to the app at https://accounts.google.com/IssuedAuthSubTokens and retried after which, I was able to access the API correctly.

Despite having the scope in the list, and the scope showing up on Google's OAuth2 grant page, the additional scope wasn't granted.