Does VMware vRO plugin for Chef work on vCenter Orchestrator (vSphere 5.5)?

I installed the following plugin in my vCenter Orchestrator v. 5.5.3 (vCenter Server 5.5):

‘Run SSH command’ workflow works but ‘SCP put’ is generating errors (e.g. can’t read local file).

Some Chef workflows like ‘Add New Client’ are giving me authentication error (even though I added Chef server successfully, I use chef server 11 and 12).

Is this plugin supposed to work on vSphere 5.5?

Does this plugin require vSphere 6?