Modern Authentication for Skype for Business Online has come out of preview but how do you turn it on. The instruction will help you enable it for your tenant and also client. Connect PowerShell to Skype for Business online in your Office 365 tenant. If you are not sure how to connect, go to this Microsoft site that will explain how Run this command that switches on Modern Authentication: Set-CsOAuthConfiguration -ClientAdalAuthOverride Allowed Now run Get-CsOAuthConfiguratio