I have been trying for youtube content api and tried with the following code

```
def main():

  credentials = ServiceAccountCredentials.from_json_keyfile_name(
    filename='bbtv-306609-b20e12d67493.json',
    scopes=['https://www.googleapis.com/auth/youtubepartner',
    'https://www.googleapis.com/auth/youtube.force-ssl',
    'https://www.googleapis.com/auth/youtubepartner'])
  http = httplib2.Http()
  http = credentials.authorize(http)
  service = build("youtubePartner", version="v1", http=http)

```

ended up with..
[![Result](https://i.stack.imgur.com/xgl0e.png)](https://i.stack.imgur.com/xgl0e.png)

And i have added the following user under members

[![Google console](https://i.stack.imgur.com/EpnEo.png)](https://i.stack.imgur.com/EpnEo.png)