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.
Cannot sign in to Skype for Business 2016 when you register the domain as a vanity domain
Applies To
Skype for Business 2016
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