Skype for Business Server: Prepare Active Directory for Skype
Before deploying Skype for Business Server 2019 in a coexistence state, you must do more Active Directory tasks to configure the schema, forest, and domain for Skype for Business Server 2019. The schema extensions add the Active Directory classes and attributes that are required by Skype for Business Server 2019.
To prepare Active Directory for Skype for Business Server 2019
On the Skype for Business Server 2019 Front End Server, run Skype for Business Server 2019 Setup.
Select Prepare Active Directory.
Complete steps 1 through 5 in the wizard.