This issue only needs to be tested in 1 device. This issue needs to be tested by a developer because it requires inspecting network requests. In the app, login in master site with the user specified in the comments (it's a student that doesn't belong to any group). Go to MM Dev Testing > BBB. Open the Network inspector. Open "BBB with separate groups". Check that an error saying that you don't have a role to join the session is displayed, and in the inspector there is no WS call to mod_bigbluebuttonbn_meeting_info. Go back to the course and now open Wikis > Group wiki. Check that an error saying that you cannot view the page is displayed (before this patch, the error said that the wiki had no content).