Use same network name and password as old network

​@ClausN is right as this is the simplest way (change your new network to the name and password of your old one).

Alternatively: https://support.sonos.com/en-gb/article/connect-sonos-to-a-new-router-or-wi-fi-network

Already has new name and pw so using same does not help. Thanks anyway 

You can change the name and password in the router settings...

This is not an issue unique to SONOS. Many users might have dozens of products on their network, such as thermostats, lighting controls, security systems, etc., that will struggle with new WiFi credentials.

Products without hardware displays are the biggest challenge. A product with a display can present a message and suggest a remedy. If it was too easy to change WiFi credentials, the kid next door or any drive-by could easily get control of anything on your network. The whole point of usernames and passwords is to give the owner control of his/her data.

But I have been using new WiFi name  and people for months with many other devices. Just want to connect Sonos to WiFi with new name and pw , not old name and pw from old router

Follow the link I posted.

It should say new name and PW