Send a co-worker or entire team a notification to get their attention when you use @mention.
Get one person's attention
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Type a message in a reply or start a new conversation.
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Type @ and the person's name.
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Select the person's name you want to mention.
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Finish your message and select Send.
Get an entire team or channel's attention
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Type a message in a reply or start a new conversation.
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Type @team or @channel.
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Select the team or channel you want to mention.
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Finish your message and select Send.
Source: Microsoft