Pi-Hole DNS not working

Im using pi-hole on casa OS running over Debian 11

I have installed from Casa OS app store and follows my configurations.

I have followed some youtube tutorials and it did not work, when I set the IP as DNS in my router the internet stop work.

Pihole settings:

Router DNS used:

Browser screenshot without internet

Does anyone know how to solve? I tried to use the address from my home server as DNS and also it did not work.

My understanding is that some Huawei routers simply don’t play nice when it comes to setting DNS servers on your lan. Even if you put a local IP they attempt to connect to it via the WAN port rather than the LAN.

There’s some information on this thread on their support page:

If it’s possible to disable the DHCP on your model and use Pi-hole’s DHCP server instead that may be worth a try.

Or, if it's not possible to disable the DHCP server, see if it's possible to set the lease pool to 1 address and then make that one IP as reserved for a MAC address that doesn't exist on the LAN.