I am trying to get COM port redirection disabled in WVD and it doesn't seem to work. The RDP property in a typical connection file (redirectcomports:i:0) doesn't seem to work and is not valid if I try to put that on the host pool properties. I also tried a GPO to disable COM ports and that also didn't work.
@kknox46 What GPO did you set? You should be able to disable com ports with the Do not allow COM port redirection policy under Computer Configuration / Administrative Templates / Windows Components / Remote Desktop Services / Remote Desktop Session Host / Device and Resource Redirection.
When trying to add the RDP property on the hostpool, are you getting a specific error?