I had a OpenVPN NAT bridge setup on this device before trying to install pi-hole. DNSMasq seems to be having issues booting back up. I am guessing it's from this setup before hand. I want to ideally not disrubt my original setup. I turned off the VPN though when installing pi-hole. Sometimes I have the VPN on, and sometimes I don't have it on.
Thanks for the detailed response. I opted for the second option and now have the admin panel working...it looks like it finished installation but I'm not sure it's working still. My router required 2 DNS servers so I put the Pi as the first one and google as the second.
Is there some way I can verify that it is working?
This is not working. There is nothing special about "primary" and "secondary". Clients can use whichever they like. You have to set both to the Pi-hole or use the Pi-hole DHCP server.