Not Able to Pass CAC Credentials to GSAD Apache Web Server


We are running GVM 10 on Centos7.

We have LDAP configured and working no issues. We can get Apache to ask for our CAC pin when we navigate to the GSAD portal, however Apache does NOT forward CAC credentials to GSAD after this intial pin entry, and after the pin entry takes us to the standard GSAD login page. Users in LDAP can then login using username and password but we would like to be able to login just using CAC. Has anyone been able to successfully authenticate to GSAD using CACs over Apache?

Any help would be appreciated.