DTR Cert problem

Hi
I am trying to install trial of DTR on our datacenter vm. UCP is already working on a second vm.
When I carryout the Docker run dtr install command I am using the local ip/hostsnames. It cannot find the self created ucp-ca.pem.
What path should I use in the command to get the cert to pick up automatically

For the trial I want to just use UCP and DTR both on local vms

Thanks

M