title: The Admin Directory users.list request returns 400 Bad request
body: <p>This happens in the API Explorer and using the .NET client API.  In the API Explorer, I was trying to use the query param, but eventually I just removed it and now send the request with no params, and it still turns around 400 even though I am authenticating successfully with OAuth2 in browser.</p>
  
  <p>Why is this endpoint broken?</p>
  
  <p><a href="https://developers.google.com/admin-sdk/directory/v1/reference/users/list" rel="nofollow noreferrer">https://developers.google.com/admin-sdk/directory/v1/reference/users/list</a></p>