@FFulde, Smartcard Redirection feature is a mandatary feature on RDSH Agent. No need to select during installation.
You could try to run command "certutil -scinfo" inside RDSH Agent machine to validate if the Smartcard redirected.
This is correct. Just use smartcard redirection on RDS host.
And for VDI (single user OS) Agent:
if we want to use Smartcard redirection, just install the smartcard redirection component during installation. No matter if you install USB redirection or not.
if we want to use USB redirection for Smartcard reader/cards, we need to uncheck Smartcard redirection component during installation, select USB redirection, and there's a Group Policy to enable Smartcard via USB redirection. (refer to USB Settings in the Horizon Agent Configuration ADMX Template (omnissa.com) "Allow Smart Cards Property: AllowSmartcard".
