How do I setup ssh key authentication?

Hello All,

I am trying to setup SSH Key authentication for the discovery and management of my systems.  I currently have ops center and the proxy on one host (ochost).  I have created a ocadmin user on the ochost as well as two client machines.  I have created ssh keys using ssh-keygen on ochost and put the key on the target systems and verified that I can ssh successfully.  I then added credentials via the Ops Center BUI:

When I try and have one of the new target systems discovered the task fails ...

Checking the logs on the other servers and ochost is not even attempting a connection, so I am assuming that error message means it cannot find the credentials??