Proactive message to user in MS Teams channel

I am using ms teams as a channel for my bot. I would like to send a welcome message to user even before they start a conversation. Could you please help me. Based on the rasa open source docs “Reaching out to user”

Once you’ve configured your channel to send a payload, you will need to specify how the assistant should react and greet the user

Can someone please elaborate this for ms teams channel

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I’m not familiar with the MS Teams channel but usually the initial message is sent by the UI widget like the chatroom welcomeMessage. You could also send this message by overriding the session_started event to send a message when the channel connects a user.