How to Install Root CA Certificates on Policy CA

Prior to installing the Policy CA certificate that is issued by the Root CA, you will need to install the Root CA Certificates on the Policy CA so that it knows it can trust the CA that issued its certificate.

To do this, copy the Root CA certs from “%SystemRoot%\System32\CertSrv\CertEnroll” on the Root CA to a directory on the Policy CA (I used c:\RootCA as an example below), and then run this script (modify paths & filenames) to add them to the local certificate store.

certutil -addstore -f Root "C:\RootCA\ROOTCA.crt"
certutil -addstore -f Root "C:\RootCA\ROOTCA.crl"

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