CAC Error Code
4012
CAC not found in reader (PIV activation)
"CAC NOT Found in Reader during PIV activation."
How to fix it
Make sure the CAC is fully inserted (chip first, gold contact up). Open Device Manager → Smart card readers — your reader should appear. If using ActivClient, set it to expose PIV: ActivClient User Console → Tools → Advanced → 'Prefer GSC-IS over PIV EndPoint' = No.
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