Solved IPv6 DNS issues on clients behind router

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Setup:
Factory default.
Only option set are wireles names, login passwords, and enabling IPv6 with a statefull network.

Issue:
Clients get the the routers IPv6 address as the IPv6 DNS server.
nslookup uses this server to (try) and resolve domain names but fails.
If I tell nslookup to use the routers link local IPv6 address it works.

Does anyone know why using the routers global IPv6 address as a DNS server not work?
Is the firewall blocking it?

 

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How is this solved already?

I thought to myself after a coffee... "Maybe its Windows being a knob."

It was.
After a few firewall resets and some config cleaning its behaving now.