Pi-Hole using RBK352 — Orbi AX1800 WiFi 6 Dual-band Mesh System 2 pack

I am having trouble getting pi hole to work using Orbi Mesh. I followed an article which said that you can either just set up and use the pi-hole DNS server or also use DHCP on the pi-hole. If I do the later it really messes up the whole system and the only way back was to do a fresh install of the Orbi system. (I couldn't even access the router via either the app or web page) However if I " Use These DNS Servers" and set the primary and secondary to the IP of the pi-hole my connection to the internet goes off.  Any ideas