Code to revoke a Microsoft CA certificate from outside the domain

I am trying to develop a .NET application to revoke a certificate obtained from a Microsoft CA.

I was able to get it working using ICertAdmin::RevokeCertificate and the pointers given in this link.

However, I find that the revocation works only if I run this application from a computer that is connected to the same domain as the CA. When run from a non-domain joined computer, it fails with the following error message:

CCertAdmin::RevokeCertificate: The RPC server is unavailable. 0x800706ba (WIN32: 1722 RPC_S_SERVER_UNAVAILABLE)

Now, my question is:

1. Is this how ICertAdmin is supposed to work?
2. If yes, is there any way to programmatically revoke certificates from outside a domain?