windows could not automatically detect this networks proxy setting

Dear all, I have read a lot on this forum about the subject that I'm going to describe, but I've not found a solution to my problem. I have a NETGEAR C7000v2 modem/router/wifi and I want to connect a Cisco RV345 (POE) router to it in order to do port forwarding and port triggering through it and in turn connect two POE WAPs to improve the wifi coverage. The problem is that if I configure de NETGEAR modem in bridge mode, The Cisco router does not acquire the public address provided by the ISP (cablelynx). If I connect any laptop to the modem, it does, but the router does NOT. I have tried a thousand ways and have not obtained good results.

I've disconnected the wifi network from the modem and only connected the router, pretending it was working in bridge mode, and the router works without problems, although I have not tried the port forwarding yet, buy I know it is not the way to configure the equipment.

Any suggestion?

Thank you in advance for the good will og you fellow forum members.

Daniel