Computer Configuration > Policies > Centrify Settings > Mac OS X Settings > Security & Privacy > Disable smart card UPN mapping
Disable smart card UPN mapping. With UPN mapping enabled, inserting a smart card changes the login UI to welcome the UPN user identified in the UPN field on the PIV card, which prevents the use of multi-user Personal Identity Verification (PIV) cards.
This policy must be used in combination with the
smartcard.name.mapping parameter to enable multi-user PIV cards on Mac devices. Refer to Enabling support for multi-user PIV and multi-user smart cards for more information.