Summary
Cumulative Update 6 (CU6) for Microsoft Skype for Business Server 2019 uninstalls the SkypeOnlineConnector PowerShell module. After you install this update, install the newer Teams PowerShell Module.
More information
Use the Skype Server Update Installer to install CU6 for Microsoft Skype for Business Server 2019. For more information, see December 2021 cumulative update 6 for Skype for Business Server 2019, Core Components.