This feature remains on the backlog. We will update you when we have status changes to share.
This feature request has now moved to “working on it”. The team is actively working on this request and I will share more details as they become available.
-WarrenJason Roth commented
I have the September 20th update and no dice. Still showing only just the single message as per #3 on the list.
Please check “Teams/Skype Consumer chat and calling interop” on the public roadmap at microsoft.com/microsoft-365/roadmap?filters.. for updates.