United States law enforcement agencies have the ability to eavesdrop on Skype conversations and to have access to Skype users’ geographic locations. In many cases, a simple request for information is sufficient, with no court approval needed. This ability was deliberately added by Microsoft for law enforcement agencies around the world after they purchased Skype in 2011.

https://en.m.wikipedia.org/wiki/Skype_security

Although I think Microsoft implemented end-to-end encryption for skype for single conversations at a time in 2018. Still, for seven years, microsoft was giving law enforcement every conversation they wanted.