Using Google Groups for giving access to an App Maker application should be possible (https://developers.google.com/appmaker/getting-started/faq#group_sharing). However, it is not working.
Now, I've tried this with two separate accounts in my company's domain, but I get the error: "Sorry, you don't have access to this application."
I'm using an intra-organizational Google Group (and organizational accounts), and have tried two different ones, another one newly created for the purpose of testing. I've tried giving both admin access and normal access through the group, not working.
I'm using the "Only allow access to specific users" option, and without that, access works just fine, and giving the rights directly without the group works. My Google account is a manager in the group(s), so I can see the members.
Creating a new clean app and trying this on it does not resolve the issue. I have also waited enough time for any member additions to groups to take effect.
Is this a bug, organizational settings doing something odd or what gives?