Using a CAC on my 2022 Macbook Air Monterey

Hey there firemedic1218,

While we're unsure of what a 'CAC' is, the more details you provide us about the issue, the better we'll understand what's happening.

In the meantime, we wanted to rule out some general possible causes:

1. If you have a compatible Mac model, the latest version is macOS 12.6. You can verify this by clicking on the Apple logo at the top left corner of the screen, then on ‘About This Mac’. This link will show how to first back up, then Update macOS on Mac.
2. We also recommend making sure that all apps are up to date: How to manually update apps on your Apple device.
3. Sometimes unexpected behavior can be resolved with a restart. Check out the section 'Restart' here: Log out, sleep, wake, restart, or shut down your Mac

Cheers!

A chip card that is used for computer access, mainly by the government or military

https://en.wikipedia.org/wiki/Common_Access_Card

For the OP: are the little lights blinking on the reader? Sometimes it helps to remove and re-insert the card.

While I can’t vouch for the content accuracy …

… and the usual “Use with Caution” caveats always apply …

… this site appears to provide a well-researched path to the answers you seek.

https://www.militarycac.com/macnotes.htm

This site IS referenced by a particular DoD software development web site which I regularly use.

Have you tried reaching out to the IT folks behind the website?

Are you giving an option to select a certificate? sometimes you can re-choose the credential on the card. I usually get this error when my card wasn't read properly.