title: Sending messages in Teams with a bot on behalf of a user
body: <p>I have an app containing a bot on Microsoft Teams, built using the bot-framework. I need my application to be able to let users send message to a specific channel and thread. I can do this with my bot using the "proactive messaging" ability, but the message is then send by the bot, not the user.
  Is there any way to achieve this as if the user sent the message?</p>