MAC asking for a PIN when CAC inserted

Hello I’m trying to access my military sites. I have done this before using my CAC and PIN. Now, though, my computer is requiring a “PIN” to unlock my computer and permission to authenticate certificates. I have tried my CAC PIN several times and it says it is wrong. My CAC pin is not wrong as I can access sites using it on government computers. My computer has just started doing this and appears to be asking for a separate PIN to first Authenticate the certificate before I can enter my actual CAC PIN to access government sites such as my pay and defense travel. I have never set such a pin on my computer. I can access my computer using password when I remove the USB CAC reader. But this is obviously a problem when I need my CAC reader inserted in order to sign in to DOD websites. I have seen this question multiple places but it is always the same answer about the Apple ID PIN. Which is not the issue here. Please help!