Unable to fetch WAN IP when connected to the Modem.

Worked for more than a year and suddenly stopped working. When i connect my old eero routers, they are working fine

T/S steps so far:

1) Rebooted devices- not resolved

2) factory reset and added new network- not resolved

3) swapped the satellites to make it as the main router- not resolved

i ran out of ideas and opened a ticket with tp-link- pending response.

please post any ideas or any troubleshooting steps to try.. thanks in advance