Cannot share Drive folders with external users

Problem

You are unable to share folders located in a Shared Drive with external users, whenever there is an attempt to do so the following error message appears: 
Permission denied, your permissions may have changed.

Environment

  • Google Drive

Solution

  1. Move the desired folder out of the Shared Drive.
  2. Share the recipient with a Contributor role or below.
  3. Have the external recipient create a non-Gmail Google account.

Cause

The Content Manager and Manager roles in a Shared Drive are exclusive for Google users.