For future reference, when replacing your router, it’s easiest all round, and not just for Sonos, to change the WIFI name and password to that of the old router.

Have you looked at the following article: 

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

Also, after replacing the router, reboot everything using the network.

Thank you for the feedback.  As the article says easy application works for only Move and Player 5 as the supported products.  They have BLE connections.

Playbar, Sub and Player 3s were not supported.  As it was suggested on the article I did factory reset and included all of these speaker in my system and hook them up as I had my original setup.

After setting up the surround sound, only sound comes from the Playbar which has optical connection to TV audio system.  Sub and Player3 s don’ produce any sound.  Even though they function individually.

I am in the trial and error mode….

If you play a music stream (a Sonos radio station or something from Deezer, Amazon Music etc) to the Playbar room, does the sound also play from the Sub and surrounds? 

If you play music on the Playbar and change the Surround Audio setting for Music Playback to “Full” does sound come from the surrounds and Sub?

Edit: @nik9669a beat me to it.

But the music needs to be from a streaming source, not a radio station on the tv, if you’re thinking the same as me, @Mr. T? 

.

Thank you all for your comments. 

I forgot to mention that I also installed a “wi-fi booster/extender” (plug-in type, same brand with my router).  During my trial an error mode when I disabled the wi-fi extender the system worked.  I am happy to get my surround sound back.  The extender will be another issue for the future.

nik9969a and  Mr.T thank you for your comments.