TokenResponseException: 401 Unauthorized Exception when trying to access Admin SDK Google API.

Question

I am trying to do an extract of users in my domain by accessing the Google Admin SDK API. I am however given a 401 unauthorized exception. The code below is my settings class th

Answer 1

Based from this thread, TokenResponseException: 401 Unauthorized occurs when having an invalid client ID, client secret or scopes. But it could also be due to refresh token overuse. Refresh the access token, if necessary since it have limited lifetimes. If your application needs access to a Google API beyond the lifetime of a single access token, it can obtain a refresh token. A refresh token allows your application to obtain new access tokens.

Check these related threads:

• Java Google Contacts API Access Service Account Authentication which states that another possible source for a "401 Unauthorized" exception is leaving the credential.refreshToken() away. The call is necessary to write the access-code into the reference.
• Always get TokenResponseException: 401 Unauthorized.

Hope this helps!