I purchased Archer AX55 to replace the Sagemcom router provided by Talk Talk. The problem is it cannot get a public IP from the ISP. I tried all the different steps and workarounds especified in the troubleshooting guides without success: factory reset, reset ONT modem, disconnect coaxial cable, update firmware, clone mac, use sagecom mac, change dhcp ip, etc but nothing works.

I tested the ont modem connecting my laptop directly and I get internet. I tested the archer router using it as access point and it works fine. So, I assume that there should be something in the settings I am missing when it set it as a main router. Anyone knows what it can be and how can I solve the issue? Thanks