Certificate Services - problem adding an OCSP Response Signing certificate

I've been following these instructions http://technet.microsoft.com/en-us/library/cc732526.aspx

I've created a copy of the OCSP Response Signing template and added the issuing server name (computer object) to the security tab with read, enroll & autoenroll set to allow. I've also ticked the box 'Publish in Active Directory'.

The certificate appears in the CA\certificate templates on the server OK, but when I request a new certificate using the certificate snap-in it does not show up (other certificates I have created do show up however).

Thanks,

Rich.