I have installed WAC 1904.1 on Windows Server 2019 (1809). I can add servers, I can browse storage remotely, see installed apps, etc. but when I try to connect in RDP, I have an error... Credentials are incorrect. But they are correct ! The account is domain admin.
For PowerShell, when I try to open a PowerShell console, there isn't the prompt.
The problem is the same with different clients : Windows Server 2019 or Windows Server 2016.