After changing my router my sonos system has never worked properly, the app constantly says ‘no products found’ I have rebooted everything and even created another sonos account but the app when first opened still says ‘no products found. If this continues I’ll be listing the system on ebay and buying another brand as this is poor from sonos,
Was you Sonos speakers working before you changed the router?
I they were, how can you blame Sonos for your speakers not working when it was you who made the network change?
There are guides for when you change your router/network to help:
https://support.sonos.com/en-us/article/connect-sonos-to-a-new-router-or-wi-fi-network
Maybe try the steps there?
But if it doesn't work for you, I will be willing to take your speakers off your hands for a fair discount so that you can move onto another brand.
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