Cannot mount NFS directory but truenas box is reachable and can mount via shell

Hey, so pretty much what it says on the title. I have 2 PVEs, pvemain [10.5.0.10] and pvecubi [10.5.0.2] (both with DHCP reservation). Pvemain is running truenas on 10.51.0.5 (which operates on a VXLAN network, if at all relevant) and pvecubi, which is a clean proxmox install.

Trying to create a NFS Directory in pvecubi throws storage 'isos-remote' is not online (500), however I can both 1) ping 10.51.0.5 and 2) mount the share directly via mount -t nfs 10.51.0.5:/mnt/tank/isos...

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