said by Arty50:
Thanks for the suggestions. I just ran the test again to confirm. It's native dual stack, not a tunnel. I'm selecting DHCPv6-PD on my router too. No dice.
What type of test? Do you have an ipv6 ip that starts with 2601: or 2001: ? Native IPv6 should be 2601, whereas 2001 is going to be a tunnel.