Broadband Light Blinking Green/Red

I just received my new modem/wireless router (Arris BGW210), and I waited til after the specified activation time to install.

Problem: the Broadband light continues to blink Green for awhile, then blink Red for awhile, then repeats over and over.

Troubleshooting so far:

-I have checked my connection from modem to AT&T wall jack, and from the jack to the NID on the outside of my house.

-I have rebooted multiple times, both with the red button AND unplugging, waiting and plugging back in

-Checked for proper connection INSIDE the wall jack AND the NID

-Checked for service outages (None)

Please do tell me to contact customer or technical support, I have tried but I can’t get through to anyone because of this Covid-19 virus causing a shortage in personnel.

This is my last hope at this point