You can @mention people in a group chat to get their attention, but they need to already be part of the group chat.
You can @mention multiple people in the same message. When you mention someone, they may be notified based on their notification settings.
To mention someone in a group chat:
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In the group chat, type @ and then begin typing the name of the person.
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Select the name from the list to mention them.
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Repeat to add more people.
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