User Configuration > Administrative Templates > Citrix Components > Citrix Workspace > User authentication
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HKCU\Software\Policies\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Virtual Channels\Smartcard
Use this policy to control how the client uses smart cards attached to the client device. When enabled, this policy allows the remote server to access smart cards attached to the client device for authentication and other purposes. When disabled, the server cannot access smart cards attached to the client device. Troubleshooting: When using smart cards in a Citrix environment, the smart card device driver must be installed on the server. When using a different operating system on the client machine, it may be necessary to ensure that the smart card device drivers in use interoperate correctly.