BuddyPress.org

That’s probably one for the bbPress forums then – https://bbpress.org/forums/ within each group with a forum there should be a forum menu item that links to the group forum. I’d first check there are no plugin conflicts by deactivating all other plugins except for BuddyPress and bbPress, if you still don’t get the menu item within the group then try a default theme such as 2016. BuddyPress forums are provided by bbPress, so that’s the best place to go for support.

https://bbpress.org/forums/