If you’re still using your Facebook account to sign in to Skype, you’ll no longer be able to do it starting January 2018. The option will be discontinued due to the rollout of the new Skype experience on desktop and mobile, which doesn’t support Facebook login.
As a result, all consumers who use their Facebook account to sign in to older versions of Skype (or Skype for web, which still supports Facebook login) will have to switch to a Microsoft account to keep using the service. Here is what Microsoft noted on a support page:
As we continue to roll out the new Skype, we’re discontinuing the option to login via Facebook in January 2018 and will streamline all Skype logins via your Microsoft account. Using a Microsoft Account will enable you to login-in via single sign-in, unlocking all your Microsoft services – including Skype, Office Online, Outlook, OneNote, OneDrive, and more – in one experience, with just one password. Currently, using your Facebook account to sign in to Skype is not supported on Skype for Windows 10, the new Skype for Android and iPhone, and the new Skype for Windows, Mac, and Linux.
Fortunately, it’s possible to transfer your contacts, Skype Credit, Skype Number and subscription balance from the Facebook account you’re using to sign in, to a new or existing Microsoft account. Microsoft detailed the steps to follow to transfer your contacts and chat history on this support page, and you can also use an online tool for transfering your payment information, Skype credit and more.Further reading: Facebook, Microsoft, Microsoft Account, Skype