Windows Server 2019 network selection user interface (UI) must not be displayed on the logon screen. GROUP ID:V-205690 RULE ID:SV-205690r958478 Enabling interaction with the network selection UI allows users to change connections to available networks without signing in to Windows.
Solution
Configure the policy value for Computer Configuration >> Administrative Templates >> System >> Logon >> 'Do not display network selection UI' to 'Enabled'.