IPv6 on LAN just can't get it going

[nh5]

Testing with a pfSense lab on a server I have in a datacenter. Host assigns me a /64 on the WAN which pfSense grabs a IPv6 address via DHCP or when I set it statically. Ping out to ipv6 addresses from the pfSense WAN works fine. However I can't get addresses on the LAN

I've tried the following

WAN
-DHCP6 option set
Prefix delegation size: 64
Send prefix hint

LAN
-Track interface interface set to WAN
prefix ID: 0

rebooted pfSense, ipv6 gateway shows pending, after cycling ipv6 settings to off then apply them again, gateway goes Online. I do have gateway manually entered. It is the first address in the /64 block.

LAN client's don't get IPv6 at all. Firewall rules are at their defaults for LAN which includes to IPv6 to any rule.

I'm getting the following in the logs,

radvd[18645]: attempting to reread config file
Aug 21 21:33:58 radvd[18645]: sendmsg: Can't assign requested address
Aug 21 21:33:58 radvd[18067]: no auto-selected prefix on interface vmx1, disabling advertisements
Aug 21 21:33:58 radvd[18067]: IPv6 forwarding seems to be disabled, but continuing anyway.
Aug 21 21:33:58 radvd[18067]: IPv6 forwarding setting is: 0, should be 1
Aug 21 21:33:58 radvd[18067]: version 1.9.1 started

it seems to repeat that commonly. Any ideas? I'm pretty new to v6 so bare with me!

[jimp]

System > Advanced, Networking Tab, is "Allow IPv6" checked?

[nh5]

Indeed it is. It comes enabled by default these days I thought. I never had to turn it on.