Whats outcome on Pi-hole for:
sudo netstat -nltup | grep "Proto\|:53 "
Whats outcome on a Windows client PC for:
ipconfig /all
*Am only interested in the DNS and DHCP bits.
Or if on a Linux client PC:
cat /etc/resolv.conf
And on a Windows or Linux client:
nslookup pi.hole
And:
nslookup pi.hole <IP_ADDRESS_OF_PIHOLE>
And this bit: