Distribute own IPv6 DNS-Server while tracking WAN IPv6

[Juuze]

Hello together,

I know there are other forum posts here on this OPNsense forum about this topic like this, but this forum post doesn't cover my current situation.
The problem I'm facing is that when I set "Allow manual adjustment of DHCPv6 and Router Advertisements" to enabled and I input my own DNS settings under Route Advertisements, my clients don't get a working IPv6-Address anymore.
I know this is down to my missing configuration of DHCPv6.My question is now how to configure my DHCPv6 correctly so that I get the same dynamic IPv6-Address distribution because I don't have a static IPv6-Address at home, just like I would use the "automatic" tracking of my WAN interface without "Allow manual adjustment of DHCPv6 and Router Advertisements" set to enabled.
Thanks for you help!

[tiermutter]

Use ULA to distribute the DNS:
Create a virtual IP for the sense using a ULA (eg fd00:10:10:01::1) and distribute this ULA as DNS via RA.

[tiermutter]