Orbi IPv6 configuration

Hello,

It doesn't seem possible to remove the IPv4 address from my orbi router configuration. However I have also set the IPv6 address within the router as defined by NextDNS router configuration guide.

When I CMND nslookup the prompt returns:

Default Server:  UnKnown
Address:  2a07:XXXX::XX:XXXX (the IPv6 DNS provided by NextDNS for config)

When I view the NextDNS profile page it states that the device is not using a profile.

NextDNS shows that IPv6 is available.

Test-IPv6.com returns a 10/10 score.

What is wrong here? I understand that setting the router to the IPv6 address removes the need to link IP or configure a DDNS. I would like a "Set it and forget it" configuration so I do not need to relink IP or renew DDNS host.

Is the IPv4 DNS setting causing issue somehow? I cannot leave those fields blank in my router configuration that I am aware of.

Thanks all for the assistance in advance.