Have you tried rebooting your router to assign the speakers new IP addresses?

Are the speaker lights white (showing they are actually connected to the WiFi).
If so, do the speakers appear if you use the Windows or Mac app instead?

I have rebooted my router more times than I can count.   

What about my other questions?

The point is…. No consumer and user should have to reboot anything or be an IT expert to assign IP addresses or anything. I agree with original poster and others. As much as I have paid for SONOS systems and it was working fine for years and years, now it breaks every update.  I just had to factory reset and add everything back last week for F sake.