Unable to mount NFS on Ubuntu 20.04

[dougfox]

Fresh install of Truenas 12 U7 and Ubuntu 20.04. I have a dataset that is shared through smb to a mac and works perfectly. I wish to share the same dataset through nfs to ubuntu.

showmount -e 192.168.0.10

Export list for 192.168.0.10:
/mnt/tank/content (everyone)

sudo mount 192.168.0.10:/mnt/tank/content /mnt/content -vv

mount.nfs: timeout set for Fri Dec 31 15:07:22 2021
mount.nfs: trying text-based options 'vers=4.2,addr=192.168.0.10,clientaddr=192.168.0.119'
mount.nfs: mount(2): Protocol not supported
mount.nfs: trying text-based options 'vers=4.1,addr=192.168.0.10,clientaddr=192.168.0.119'
mount.nfs: mount(2): Protocol not supported
mount.nfs: trying text-based options 'vers=4.0,addr=192.168.0.10,clientaddr=192.168.0.119'
mount.nfs: mount(2): Protocol not supported
mount.nfs: trying text-based options 'addr=192.168.0.10'
mount.nfs: prog 100003, trying vers=3, prot=6
mount.nfs: trying 192.168.0.10 prog 100003 vers 3 prot TCP port 2049
mount.nfs: prog 100005, trying vers=3, prot=17
mount.nfs: trying 192.168.0.10 prog 100005 vers 3 prot UDP port 859
mount.nfs: mount(2): Input/output error
mount.nfs: mount system call failed

I've specified -t nfs -o vers=3 and always returns as mount system call failed. In Truenas I've tried maproot user & group and enabling NFSv4.