Hi Markkaminski,
Please check the below:
1. What is the HPC version you installed for head node and the new workstation nodes?
Can you log onto the head node and one of your new workstation node to check the version number of HPC server components? (Control Panel -> Programs -> Programs and Features)
2. Have you selected the correct cluster name when installing the new workstation nodes? You shall select the head node machine name as the cluster name.
Please log onto one of your new workstation node, run "cmd", then run "echo %ccp_scheduler%" in the cmd console to check if the output is same with your head node machine name.