Thats because there were also two different Skypes - Skype for Business (which was Lync) and Skype. Two totally different platforms with different code. God kno

Thats because there were also two different Skypes - Skype for Business (which was Lync) and Skype. Two totally different platforms with different code. God knows why they named them the same. Teams is supposed to completely replace Skype for Business