My ISP recently enabled IPV6 and I have the option for IPV6 turned on in the EERO app. I used on of the IPV6 test sites and scored a 9/10. The one error states “Your DNS server appears to have no access to the IPv6 internet, or is not configured to use it. This may in the future restrict your ability to reach IPv6 only site.” I have EERO Plus which handles my DNS, is this error message a concern at all?
A long shot here but it seems like I got the same error message on various IPv6 test sites after activating IPv6 on my eero a month ago but It cleared up after either rebooting or factory resetting my modem.
I do remember the error never caused a problem for the few days before I did this and it cleared up on its own a few days afterwards with 10/10 finally received here for example: https://test-ipv6.com.