DNS issue with router. Not sure if router is passing DNS information through.

I have 2 R7000 routers setup. One works and one does not due to DNS. The good router is the primary. On the router that does not work, if I manually setup google DNS, good router IP, or ISP DNS on the computer's network settings, it works fine. If I manually input that information inside the bad router's web GUI DNS settings, my computer's that have the bad router as it's DNS server will not navigate online. 

It has worked before but stopped working now. How can I be use the wireless router is forwarding the router IP to a dns server?