Coax F-connector WAN Port connection error Google Wifi Mesh Router *AC1200

[ida2d8z]

My only option for Wifi is Cox fiber optic cable that connects via a Coax F-connector for the WAN port.  I have a separate box that connect the ARRIS Cable modem TM3402 DOCSIS 3.1 to the COX panaromic Wifi gateway.  I took my Google Wifi Mesh Router AC1200 and the ethernet cable provided and removed the COX panaromic gateway connection and replaced it with the ethernet cable connected to the Google Wifi Mesh Router. Great that appeared to work fine. Then I tired to connect the other two Google Wifi Mesh Routers AC1200 to the network with the Google Home app.  Unfortunately while it was checking the internet connection I keep getting a message: "Check WAN connection" An ethernet cable does not seem to be plugged into the WAN port properly. Please check it and try again.   I assume I am getting this message because the WAN port is a coax F-connector and so the Google Mesh Router is not connected directly to the modem, but though this other device.   I have read everything I can find about this issue, I have chatted with tech support people, but so far no luck in figuring out how to get the Google Mesh Router to  connect via the Google Home App.  I am so frustrated. I am wondering now if MoCa adapters would fix the issue but don't just want to buy things that I don't really understand how they work and may not resolve the issue.  Any help?  Anyone familiar with COX Arris Cable Modem TM33402 with the Coax F connector. I can't use an ethernet cable to connect to a WAN port because there is no such port on this modem.

Thank you anyone who can help me.

[EdwardT]

Hi ida2d8z,

Thanks for reaching out. I'm sorry to hear that you're having an issue with setting up your Google WiFi. Just to clarify, were you able to set up the parent point of your Google WiFi?

Looking forward to your response.

Thanks,

Edward

[Jeff]

Hi, ida2d8z.
I just wanted to jump in real fast to see if you saw Edward's reply and to see if you still needed some help on this or if you were able to get it sorted out. If you are still needing some help, just let us know and we'll be happy to continue helping.
Thanks.

[Jeff]

Hi, everyone.
Just one quick final check in here since activity has slowed down. We'll be locking the thread in the next 24 hours, but if you still need help, I would be happy to keep it open. If there's more we can do, just let me know.
Thanks.

[Jeff]

Hi, everyone.
As we haven't had any activity here recently I'm going to go ahead and close the thread. If you have more to add, feel free to start a new discussion.
Thanks