Skype is currently experiencing an outage in the U.S., Europe, Asia, and other parts of the world. Microsoft has acknowledged an issue affecting Skype sign-in, calls, messages, search, mobile sharing, payment systems, SMS and other services. Users report that they are getting signed out of their Skype account automatically. There’s no estimated time of repair, but it has been set as priority, Microsoft has said. Update: Microsoft has resolved the problem and Skype is back online.
Source: https://www.bleepingcomputer.com/news/microsoft/skype-is-down-worldwide-microsoft-working-on-issues/