Hello
It sounds like you may need to update the driver to ensure the reader is compatible with the build of OSX you have.
This site is a great resource for this.
https://militarycac.com/macnotes.htm#see_the_reade
If you update the driver, and the smartcard is still not working as expected, please try to follow these general steps and let us know if you still see issues once complete.
Centrify Express Smartcard Troubleshooting
I hope this helps get you working again.
Have a great day!
Ryan V.