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You might be better off following this guide. How to Configure pfSense: The Ultimate Setup Guide for 2024 (comparitech.com)
Your settings look OK - they match my IPv6 settings on my pfSense router. I'm not sure you are getting an IPv6 address on LAN - it should be something like 2a00:23c8:xxxx:xxxx:yyyy:yyyy:yyyy:yyyy - at least that is what mine looks like. By the way you can change MTU to 1500 but that won't fix your curreny IPv6 issue. What do you have on the WAN firewall rules? I have a WAN rule for IPv4+IPv6 ICMP (ping).
On LAN interface settings you need to set IPv6 Configuration Type to Track Interface and IPv6 Interface to WAN. IPv6 Prefix ID can be set to 1. You will also need to change the WAN_PPPOE Monitor IP to something like 1.1.1.1 as the BT gateway router won't respond to pings.
@brookheather I've assigned a static ipv6 address to my LAN. Am looking to run IPv6 internally as well.
static settings
Default gateways
In terms of WAN firewall rules, it's deny everything. I would expect the IPv6 ICMP reply packets to be allowed through as they are related, as it happens with IPv4
Cheers ws
You can't set a static IPv6 address on the LAN interface - change the config type to Track Interface.
Thank you @brookheather for your help.
Cheers ws