gmail api gives failedPrecondition error

Question

I can\'t get gmail api to work. I\'m using server-to-server authentication with JWT.

google-api-python-client==1.4.0
httplib2==0.9
oauth2client==1.4.7
pycryp         


        

Answer 1

Try:

credentials = SignedJwtAssertionCredentials(client_email,
  private_key,
  scope=OAUTH_SCOPE,
  sub='user@yourdomain.com')

The sub= tells the Service Account which account you wish to impersonate. Without it, you're authenticating as the Service account user which, as Eric pointed out, doesn't have a Gmail mailbox.