Can't get Pi-hole working, dns won't resolve

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If your iptables output matches mine, you wont need to alter with iptables because your rules already allow all.

Below is a good tool to test DNS from a client before you make alterations to your router settings.
You can also run this one on Pi-hole itself to test:

nslookup pi.hole 192.168.1.84

First check if the pihole-FTL daemon is actually listening on DNS ports 53 UDP/TCP (and others used by Pi-hole) with below:

sudo netstat -nltup | grep 'Proto\|:53 \|:67 \|:80 \|:547 \|:471[1-8] '

If that checks out ok, check interface/IP configured for Pi-hole:

grep 'PIHOLE_INTERFACE\|IPV[4,6]_ADDRESS\|DNSMASQ_LISTENING' /etc/pihole/setupVars.conf

See if it matches with the actual interface that holds the 192.168.1.84 IP:

ip -4 -br a

If that checks out ok, it might be that your router is doing a thing called "DNS rebind protection":

EDIT: forgot to mention but sometimes AV software can mangle DNS lookups: