After much searching how to fix this problem, I accidentally stumbled across this fix for my own setup. Admittedly a new linux user, so I am not sure why this works for me. However, I was having the same issue as shown above (selecting both ipv4 and ipv6 where ipv6 would not enable) and I figured since the pi-hole was the first thing I installed on a Orange Pi Zero, I might as well start over completely, I re-configured the micro-sd card with the armbian ubuntu, and I forgot to sudo apt-get update or sudo apt-get upgrade and immediately installed the pi-hole. It may fail the install, but re-install again and it will fix the ipv6 enabling issue. Then you can sudo apt-get update and sudo apt-get upgrade. I have performed this action twice (I forgot how I fixed the issue the first time) and it worked both times.
Hey,
this thread is a little bit dusty, but i try to figure out the same problem.
- I have no ipv6 connectivity from my ISP.
- I have no ipv6 in my homenetwork (https://b2discourse.pi-hole.net/original/2X/0/060c1585df98208de23651d6ff15da3a1a7f0da3.png)
- I set up pihole with "IPv4 and IPv6 Block ads"
(https://b2discourse.pi-hole.net/original/2X/8/8d33eb08003a7a453634cab4b93edb52cbae7c46.png) - I use FTLDNS and unbound (the all around solution
)
PiHole works fine, all ads are blocked but in the query log sometimes i can see that ipv4 urls are blocked and ipv6 urls are forwarded.
Like:
@jacob.salmela If i fix this like you suggested with:
AAAA_QUERY_ANALYSIS=no
Does it only hide this entry from showing up in the querylog? Or should i disable ipv6 blocking in the pihole setup because i have no ipv6 connectivity from my ISP at all (and no ipv6 in my home network)?
Thanks in advance 
That only ignores IPv6 queries when generating stats. You can not prevent clients from making IPv6 queries, but you can ignore them in stats.
I had the same issue and after banging my head against the wall for a good day or 2 I found that my router had a separate section for IPv6 DHCP creation. Once I disabled that in the router the PiHole took over and everything was working correctly.
From many of the sites, I Got an information regarding IPV6 connectivity but is this mandatory with all the Printers to get connect with the IPV6 connectivity as I worked on Epson printer and getting Epson Printer wifi connection Problems, How one can able to get configure this issue?
I hope I am asking this question in the right way.