I can confirm that looking at the documentation, the get-groupby-ID
API does not support oauth
scopes, meaning that it cannot yet be used by Forge.
I have reached out to the team internally and they are aware of this misalignment between the 2 APIs and are in the process of fixing this.
I cannot give you a date yet but it is being worked on and this API should be usable by Forge very soon
Cheers,
Xavier