has anyone tried to use longhorn shared volumes (RWX) on EKS? I am definitely missing a step. the error I see from the share-manager-pvc is "NFS server is not running, skip unexporting and unmounting volume". not sure how to get one running on an EKS node?

Does the eks ami have nfs package installed? I don't believe Amazon Linux does by default. You would need to make a custom ami with the nfs-utils and open-iscsi package installed for this to work.