DHCP CGNAT

I have a house in Spain where I have a fiber connection which uses CGNAT.

Recently I’ve replaced my AMPLIFI router for a dream router. The AMPLIFI obtained the WAN IP through DHCP and the dream router doesn’t.

When I put in the settings manually (obtained from my AMPLIFI) it’ll connect to the internet.
But now when the IP changes I won’t have connection nor can I obtain the new IP address.

Since I’m not permanently living there that’s quitte the hassle cause I have CCTV etc which need internet.

Is there anything wrong with my settings?

I’ve already contacted the provider, they offered a static IP for €25p/m which I don’t really need, I don’t really care if the external IP changes sometimes as long as the DR obtains it automatically.