Ok, no problem. I added INTERFACE as a variable and added ovs_eth0 as I checked over ssh. It is certainly the correct interface. Debug says the following:
*** [ DIAGNOSING ]: Networking
[✓] IPv4 address(es) bound to the ovs_eth0 interface:
192.168.2.200/24 does not match the IP found in /etc/pihole/setupVars.conf (Use IPv6 ULA addresses for Pi-hole)
and still does not resolve DNS...