We have resolved the incident and have resumed normal service.
Affected services: Instant messaging
Affected products: Skype for Android, Skype for iPad, Skype for iPhone, Skype for Linux, Skype Lite, Skype for Mac, Skype Professional Account, The new Skype for Android and iPhone, The new Skype for Windows, Mac and Linux, Skype for Windows 10, Skype for Web, Skype for Windows desktop
Affected countries/regions: Brazil, Europe, United States