This client is using an IPv6 DNS server. If you really need IPv6, you should use a ULA address for your Pi-hole and use this as IPv6 DNS server. Otherwise, disable IPv6 if you don't really need it.
This client is using an IPv6 DNS server. If you really need IPv6, you should use a ULA address for your Pi-hole and use this as IPv6 DNS server. Otherwise, disable IPv6 if you don't really need it.