After running pkispawn to install KRA, you should see an "Installation Summary" displayed where it shows where to locate the PKCS #12 file.  the p12 file is a package consisted of the your admin cert and its keys.  Password is what you specified in your pkispawn config file.

For more detail, check out https://access.redhat.com/documentation/en-us/red_hat_certificate_system/9/html-single/planning_installation_and_deployment_guide/index#Installation_and_Configuration

If not sufficient please report the issue.

thanks,

Christina