It looks like some people in the thread below have figured it out — we actually have this. You can start a chat both ways; the system will automatically recognize if this person is on Skype for Business or on Teams.
Thanks and let me know if you have any questions.
An error occurred while saving the commentSerge commented
Why the Teams' chat is neither synchronising with Skype for Bus chat nor with Outlook chat journ? How to get a single communication history?Serge supported this idea ·