I have tried running my Python code in PyCharm which aims to read my client's emails (both recent emails and real time emails). I am currently testing this on my own Gmail account. My script is attempting to use the Gmail API's watch feature to receive real time email notifications.
I am using a main script (main.py) and another dedicated to the webhook process (webhook.py).
However, every time I run my main python script the following error message appears (even though every other section of my code is functioning perfectly - which deals with reading the current unread emails in the inbox).
*(Actual project ID replaced with '(PROJECT ID)'
An error occurred: <HttpError 403 when requesting
https://gmail.googleapis.com/gmail/v1/users/me/watch?alt=json returned "Error sending test message to Cloud PubSub projects/(PROJECT ID)/topics/gmail-notifications : User not authorized to perform this action.". Details: "[{'message': 'Error sending test message to Cloud PubSub projects/(PROJECT ID)/topics/gmail-notifications : User not authorized to perform this action.', 'domain': 'global', 'reason': 'forbidden'}]">
It is unclear to me what is causing an unauthorized access error when the permissions/roles for my service account should be sufficient (listed below). What could be the cause of this issue and how do you resolve this error message?
Additional information:
-When I run my webhook.py script afterwards it appears to be functional with no error messages.
-These are the listed permissions for my service account:
Cloud Pub/Sub Service Agent, Pub/Sub Admin, Pub/Sub Editor, Pub/Sub Publisher, Pub/Sub Subscriber.
Permission for the user (my Gmail account): Owner
-Push notifications has been selected in the service account.
-Here are the scopes listed in my main script:
SCOPES = ['https://www.googleapis.com/auth/gmail.readonly',
'https://www.googleapis.com/auth/gmail.modify',
'https://www.googleapis.com/auth/gmail.metadata']
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