I am looking at this API: https://developers.google.com/admin-sdk/groups-settings/v1/reference/groups/get
However, when I try the test at the bottom, it always returns 400 Bad request. I have tried using the Google group email address (without the @gmail.com and with the @gmail.com) for several groups I am in.
How do you find the groupUniqueId for a Google group?