This feature request is still working its way through the backlog queue.
Thank you so much for this feedback. I was actually sitting with a user yesterday who was struggling to add users to a channel because she was typing in names one by one, which is a normal inclination. I showed her that she can put any distribution list into the field (for example, email@example.com) and it would invite everyone who is on that email address. Try it out and let me know if you have any more questions. I’ve also routed this feedback to design so they can implement a sign or something to show people that they can do this.
Thank you for helping us make Teams awesome!
SuphatraMartin DUggan commented
You can add 365 groups (or other teams). I discovered that by accident :-)
Due to prioritization of other work-items this has been moved to the backlog. We will update when it is being actively worked on again.
Thanks.Martin DUggan commented
This would be a really good feature!