When running Umango versions prior to Umango 23 or after upgrading to Umango 23 from previous versions, you may experience a 400 Bad Request error when trying to export to Google Drive. This is due to changes in the Google API that are addressed in the Umango 23 Google Drive connector.
I am running a Umango version earlier than version 23: To resolve the issue you need to upgrade to version 23 and then follow the steps for Umango 23 users below.
I have recently upgraded to Umango 23: You need to clear out all old oAuth tokens and create new ones by following the oAuth flow provided within Umango:
Once the new oAuth flows have been completed Umango will be able to connect to Google Drive once again.
Link to this article http://umango.com/KB?article=126