Please note that 2-node clusters are not supported. You should add a third node.
I assume you configured archiving to a FQDN. Is DNS properly configured on the worker and can it resolve the FQDN?
Did you configure system notifications under Administration > General? Are you receiving any system notification telling you that archiving is failing?
In worst case, SSH to the worker and take a look at /storage/var/loginsight/runtime.log -- search for NFS and you should see what the issue is.
I hope this helps!