This issue only needs to be tested in 1 device. In web as teacher/admin, create a forum with forced subscription (in master site, MM dev Testing > Forum > Standard forum ("foro") (with posts made by deleted users) English). In web, login as a student enrolled in that course and enable forum digests (Forum preferences in your Preferences). In web as teacher/admin, add a new discussion to the forum marking the checkbox to send notifications immediately. Now you'll have to wait for the digest notification to arrive, and that can take several hours (it's done once per day). If you're testing this using a local site you can speed it up following the Testing instructions in  MDL-68731 , but please notice that in my case the notification used "localhost" as the site URL instead of my IP so the app filtered the notification because it thought it didn't belong to the site. Once you receive the notification, click it. Check that the app opens the notifications page and you can see the digest in there with all the posts.