This feature request is still being reviewed. The team is working hard to make numerous changes with regards to notifications, but they haven’t forgotten about this item.
I hope to have more details soon.
Please add to the comments if you are experiencing this. I would like to know the OS and device you are using as well.
I’ll bring this feedback to the feature team and help get this investigated.
-WarrenVictoria Bynum commented
I'm not getting notifications on my phone (IOS) or on my computer (Windows 7 operating system, Dell computer) for messages to channels. I get notifications for chats.