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 commentCraig Thoendel commented
We're not going to allow anyone to use Teams until this is fixed.
We are working on a design with more density in mind. Until this design is solidified we are putting this item back to Under Review.