Cannot sign in to Skype for Business 2016 when you register the domain as a vanity domain Content provided by Microsoft Applies to: Skype for Business 2016 Select Product Version All Products This issue occurs when the domain name of the SIP user is registered as an Organizational ID (OrgID) and Microsoft account (MSA) domain. Resolution To fix the issue, install the April 4, 2017, update (KB3178717) for Skype for Business 2016. Last Updated: Apr 4, 2017 Was this information helpful? Yes No Tell us what we can do to improve the article Submit Thanks! Your feedback will help us improve the support experience.