The main routers IP is set to 192.168.1.1 while the second routers IP is set to 192.168.2.1.
We have 4 Sonos ones working on first router and was trying but with little success to get 4 more Sonos ones running on the second router.
Both laptops and phones connect to second network via WiFi but am unable to find Sonos devices even when I connect them via ethernet cable directly to the second router.
Best answer by jlarue
Each had to be plugged into the second router to setup but are now working wirelessly.
Thanks for your support!