The Admin Directory users.list request returns 400 Bad request

Question

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.

Why is this endpoint broken?

https://developers.google.com/admin-sdk/directory/v1/reference/users/list

Answer 1

The problem was the customer field was not filled in. It must contain a valid customer id. Once I populated that, it worked.

Really wish Google would work on providing better error feedback and improve their docs. This field (as of today) is still listed as optional.

Answer 2

As the documentation says:

either the customer or the domain parameter must be provided

I tried to specify domain name and it worked.