This is the common/expected behavior that If no smartcard is present when the client/login screen is started, horizon client goes straight to the manual login option. And could you please explain your detail requirement on "Horizon client login screen is waiting at the smartcard login screen, with the secondary option to manually login."? you means horizon client will stack at smart card login dialog and wait for user to insert smart card? I am confused that this scenario that if there always have no smart card, how long horizon client will move to AD login from your testing. It will be appreciated that if you list the detail steps about the user scenario that you tested.