How do I start a private chat?
Starting a new chat in Microsoft Teams
How do I start a private chat?
To send a private message, first click New chat at the top of the app to start a new conversation. Type the name of the person or people you want to chat with in the To field. Then, compose your message and click Send 
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Need to add someone to a chat that's already going on? Just click Add people in the upper-right corner of the chat.
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