The Graph API is currently not allowing me to grab the wall feed of groups that the currently logged in user's friends belong to. I'm able to see the feed if I navigate to the group manually, but the Graph API is not allowing me to access the feed. The documentation states that the feed (wall) can be accessed with any valid access_token, user_groups, or friends_groups (provided that the group has privacy settings set to OPEN). Is this an error in the documentation or am I missing something?
Solution found. Turns out I just needed to give the app the "read_stream" extended permission to access the wall feed.