403 on insert new post via python api

"""A simple example of how to access the Google Analytics API."""

import argparse

from apiclient.discovery import build
from oauth2client.service_account import ServiceAccountCredentials

import httplib2
from oauth2client import client
from oauth2client import file
from oauth2client import tools



def get_service(api_name, api_version, scope, key_file_location,
                service_account_email):
  """Get a service that communicates to a Google API.

  Args:
    api_name: The name of the api to connect to.
    api_version: The api version to connect to.
    scope: A list auth scopes to authorize for the application.
    key_file_location: The path to a valid service account p12 key file.
    service_account_email: The service account email address.

  Returns:
    A service that is connected to the specified API.
  """

  credentials = ServiceAccountCredentials.from_p12_keyfile(
    service_account_email, key_file_location, scopes=scope)

  http = credentials.authorize(httplib2.Http())

  # Build the service object.
  service = build(api_name, api_version, http=http)

  return service


def main():
  # Define the auth scopes to request.
  scope = ['https://www.googleapis.com/auth/blogger']

  # Use the developer console and replace the values with your
  # service account email and relative location of your key file.
  service_account_email = ''
  key_file_location = ''

  # Authenticate and construct service.
  service = get_service('blogger', 'v3', scope, key_file_location,
    service_account_email)

  response = service.posts().get(blogId='', postId='').execute()
  p = response
  response = service.posts().insert(blogId='',body=p).execute()
  print(response)


  # profile = get_first_profile_id(service)
  # print_results(get_results(service, profile))


if __name__ == '__main__':
  main()


I thought that problem is in format of body, but even if I try to get 
content from one post and create new one with the same content - I getting
"returned "We're sorry, but you don't have permission to access this 
resource."

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