nfs export to ipv6 client

My NFS exports are accessible via IPv4 to a number of hosts on my LAN. I want to make these exports available via IPv6 so that I can mount them to my laptop when I'm away. When I'm away I can access these LAN hosts via their IPv6 address and from them can access my laptop via its IPv6 address. So I assume that the blocking issue is in the NFS configuration somewhere. So here is a line from the server's /etc/exports: /export/test 2001:123:a:b:c:d:e:f(rw,nohide,insecure,no_subtree_check,async) where that IPv6 address is the laptop's network device through which I can ping from the NFS server, open a SSH session... And here is the corresponding line from the client's /etc/fstab For the IPv6 address I have tried [address] '[address]' and simply address. But in all cases, attempting to mount returns the error mount.nfs: access denied by server while mounting address:/export/test