Unable to mount NFS share on CentOS

[DTreurniet]

I am running a cluster (CentOS) for which I recently acquired a Chenbro running FreeNAS to use as a main storage server. I am a Linux hobbyist but certainly not a professional and I am stuck trying to mount an NFS share on the cluster. I have tried all kinds of different ideas on this forum, but none are working for me. I hope someone here can help me find the issue. Below is the output after trying to mount:

The NFS share is setup with the client IP as authorized host and the client is also listed in the global network host names.
Any ideas?
Cheers,