HELP! WAN & LAN clients cannot communicate

[Jims-Garage]

Hello,
Hope you can help. I've recently moved from Sophos XG to OPNSense where I had everything working as expected. Now I have the following issue:

For services like Jitsi Meet and MiroTalk, when a wan and Lan client join the server they cannot communicate (Lan and Lan) works as expected. I think this is due to some NAT/udp randomisations but I'm struggling to fix. I have the necessary port forwards in place on the wan (jellyfin and Plex work fine).

Any help would be greatly appreciated.