pfSense and IPv6 configuration in 2020



I’m currently trying to setup pfSense inside of Proxmox to route my traffic and also to provide DHCP to all VMs.

IPv4 is working great so far, but I can’t get IPv6 working.
I’ve already tried this and some other configurations found on Google, but I was never able to ping any IPv6 address (always timeout -> packet loss).

This is my network configuration on the hypervisor (Proxmox):

auto lo
iface lo inet loopback

auto eno1
iface eno1 inet manual

auto vmbr0
iface vmbr0 inet static
		address IPv4_IP
		gateway IPv4_GATEWAY
		bridge_ports eno1
		bridge_stp off
		bridge_fd 0

iface vmbr0 inet6 manual

auto vmbr3
iface vmbr3 inet manual
		bridge-ports none
		bridge-stp off
		bridge-fd 0
iface vmbr3 inet6 manual

The pfSense VM has vmbr0 assigned as WAN and vmbr3 assigned as LAN.
The IPv6 configuration in pfSense is the same as here ( except I’m using my DUID (for /56 prefix).
LAN isn’t working:
-> Track Interface results in no IPv6 assigned and
-> Static IPv6 results in no connectivity as mentioned above

Could anybody help me or has similar problems?

Many thanks!

Friendly Regards