UI/UX bug: "Start a new conversation" should be a button
It is very common (especially with new users) to make the mistake of starting a new conversation instead of replying to an existing one. People are used to WhatsApp groups that doesn't have threads of conversations, so, they always go to the text field at the bottom of the screen to reply to previous messages and ignore the "Reply" links at the bottom of each conversation.
The "Start a new conversation" today is just a textfield with a placeholder. The textfield is already there, so, the users go there and doesn't click on the "Reply". This is a huge problem, because some other users do use the "Reply" options, and Teams reorder the conversations, and make it all a big mess, losing the context in the conversations.
Compare the difference in the attachment.