Teams Meeting chats are only visible to people who were invited to the meeting. If someone joins late or isn’t invited, they won’t see the previous conversation.
If others need to be part of the discussion or you want to continue the conversation after the meeting ends, create a group chat instead.
Use group chats - instead of meeting chats - when you want to:
Tip: Start a group chat before the meeting and paste the meeting link inside. That way, everyone stays on the same page and the conversation continues seamlessly.