This feature request is still in the works. No additional updates are available at this time. I’ll keep you posted as I hear more.
122 votes13 comments · Public » Apps, Connectors, Messaging Extensions · Flag idea as inappropriate… · Admin →Matt commented
How do you make teams the default IM from Outlook?
Hate to be the bearer of bad news. This item has been declined. There will be no work to hide or remove the reply button.
As many people have commented, a big ask is to help improve how people distinguish between giving a reply and starting a new message.
For that the focus will be on this item. “Better visual delineation between `Reply` and `Start a new conversation`”