Roon no longer sees Meridian 218

Core Machine (Operating system/System info/Roon build number)

Macpro OS Catalina. Roon 1.7 (Build 528)

Network Details (Including networking gear model/manufacturer and if on WiFi/Ethernet)

New Movistar Smart Router (Telefonica, the fiber optic provider, deploying thousands of them among Spain and South América customers). Askey HGU RFT3505VW.

Audio Devices (Specify what device you’re using and its connection type - USB/HDMI/etc.)

Meridian Home Theatre connected by a Meridian 218 device to Macpro/Roon

The problem:

My original configuration was as follows:

Router + Powerline + Switch + connexions to 218, MD600 and 861.V6. Everything worked fine until
I changed the Router following Movistar instructions. Now I can’t see the 218 device but I can see it using Soolos browser (ControlMac no longer available).

Following indications from a community member, I connected the 218 directly to the router to bypass the powerline network and check if the powerline was the problem, but the problem remains.

Would the Router setup be preventing the 218 to be seen as a Roon available audio device?

Please help

Alejandro