i'm creating some test apps using cardspace. When I use personal cards i have no problem to manage what I need. My problems start when i try to work with managed cards. I prepare Webservice (using WCF) which need managed card to authenticate. When i call this service CARDSPACE UI appears and my managed card is only card which can be selected (this is what I suppose what it will do). However, when i choose this managed card i see preview of card with marked required claims. Claims resources are blank (of course, i don't enter any value). CardSpace UI dialog tells me to use Retrive button. When I do this error in form of dialog appears. In dialog there is something like this: The personal card that is used for authentication of the managed card cannot be found. If you have a backup file containing the missing personal card, restore the card. For additional information, contact the card provider. I don't know what this error means (as i said above, I'm new in Cardspace). Any suggestion to solve this error