BotBuilder-MicrosoftTeams Can't @mention a Team or Channel

When sending an Activity into a Channel, you can @mention a single user, but you cannot do the same for a Team or Channel. This would be very helpful functionality for starting conversations that should be seen by an entire team.

For mentioning a user (using C#), it's as simple as this:
// there is a ChannelAccount object with the correct ID called userAccount activity.AddMentionToText(userAccount, MentionTextLocation.PrependText, "Firstname Lastname");

Ideally, it would be just as simple to mention a team, like this:
activity.AddMentionToText(teamAccount, MentionTextLocation.PrependText, "Team Name");

Jul 11 '18 15:07 theDL

We actually have this working but haven't turned it on because doing so opens up potential for abuse which we haven't yet implemented the ability to detect or prevent. I'm investigating ways to turn this on without necessarily having to do that, but we don't have an ETA.

Note: Adding answer from stack overflow response.

Jul 16 '18 10:07 arun-msft-zz

Lol that was me asking the question on stack overflow, thanks for the response here as well.

Jul 16 '18 20:07 theDL

Any news concerning this issue and the timeline it would be fixed ? This is a feature I would like to use for notifying a team of "human" users when my bot cannot answers a question so that a human can take over the conversation. Many thanks!

Oct 24 '18 14:10 rebelanger

@rebelanger - We don't have ETA for this yet.

Nov 09 '18 12:11 Wajeed-msft

Any news on this please? Was it marked as closed because it is fixed now? I am still unable to @ mention the team and channel

Feb 20 '19 03:02 andylwelch

It should not have been closed. It still has not yet been implemented.

Feb 20 '19 04:02 billbliss

The only way that I have ever seen this work is if you use a HeroCard with an ImBack button - for whatever reason, when someone clicks on the button in a Teams channel, it includes an @mention at the bot.

Apr 23 '19 19:04 ericrrichards

Is there any update on this?

Jun 20 '19 12:06 Sfonxs

Checking for any updates or ETA on this

Aug 16 '19 21:08 pkpio

Also wondering if there's an update on this?

Sep 04 '19 10:09 ReeceKenney

Any update?

Oct 17 '19 22:10 idiotleon

Any update on this?

Feb 08 '20 03:02 AngryVirginian

Any update on this?

Feb 11 '20 08:02 ahmetkocadogan

@Wajeed-msft @arun-msft-zz Hi guys, any update or ETA on this feature?, it would be perfect for something I'm working on, mentioning 2k users individually doesn't seem good to me :/