Use @mentions to get someone's attention in Teams
An @mention is like a tap on the shoulder — a way to get someone's attention in a channel conversation or a chat. In the box where you type your message, type @, then type the first few letters of the person's name. You can also @mention entire teams and channels.
To get someone's attention in a channel conversation or a chat, @mention them. Just type @ before their name and then select them from the menu that appears.
They receive a notification, which they can click to go directly into the point in the conversation where they were mentioned.
To get the attention of an entire team:
•Type @team to message everyone on that team.
•Type @channel to notify everyone who has favorited that channel.