Update: Skype access is restored and everything is working properly.
If you’ve tried to sign in to your Skype account but wasn’t able to do so then you are not the only one. Skype is having issues and Microsoft knows about them and is trying to fix them.
A malware, named as XcodeGhost, was able to infect iOS apps and created a security breach. Applications were infected because of using modified version of Xcode by developers as they were convinced for using this version instead of the standard one.