Can we get member list from a created google group using AdminSDK without super user's right on GAE

As mentioned in the title, Is there anybody know how to get member list
belong to a created google group using AdminSDK without super user's right.
I tried on GAE but always received the following error :

「Not Authorized to access this resource/api」

I need this because I want to create something like a noticeboard using GAE
and take benefit from AdminSDK to limit user post based on their group that
they are belonging to.

They are of course already added to each specific created google group

I got supper user to enable everything for me but he does not give me the
access to his account.

Thank you!