Trying to get Matter to work with Synology. How to enable IPv6 for host on Container Manager?

Hi. I have Home Assistant installed in a docker container on my Synology but I need it to work with Matter-Server which I have also installed. It turns out that matter devices only communicate through IPv6 and when I look at my container manager I see that for host, the IPv6 is disabled.

IPv6 is enabled on the Synology network interface so this is a docker/container manager set up issue.

Is there a guide for how to do this with container manager anywhere? I’ve see this guide for native docker Enable IPv6 support | Docker Docs but I am not sure now it relates to the Synology container manager version or even where the container manager files are located.

Help!

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I’m also trying to get this to work, but have had no luck. This was the best guide I could find that walks through the end-to-end setup:

However I keep getting stuck running docker network create --ipv6 $NETWORK with the following error:
Error response from daemon: could not find an available, non-overlapping IPv6 address pool among the defaults to assign to the network.

Seems like its a common issue from these 2 github issues, and may be fixed soon in Docker 27, but DSM is only using Docker 20 so far.