S1 no longer working

Thanks.  I confirmed the the Sonos S1 Controller.app is listed and Allows incoming connections.  I did delete the original S1 Controller.app listed there and re-added it to see if that would help.  So far, no change but maybe eventually that might be helpful. :-)

So, while I’m not 100% sure here, if you have your Mac connecting to a different Eero than the BOOST is wired to, it’s possible that it specifically won’t be able to ‘see’ the Sonos system, while the iOS clients, which appear to be able to see the Sonos, would be connecting to the Eero subnet that the Sonos is on.

The thing that is confusing is your statements around ‘wifi’ and Eero. How many ‘WiFi signals are there? Is everything on Eero, or is Eero running in parallel with your WiFi? What signal are your iOS devices that can see the Sonos connected to, what signal is your Mac connected to?

Since you’re able to control via iOS, and not the Mac, then it’s not important which channels are in use, that was a potential issue inly before I understood that the iOS devices are working, and it was only the Mac hat was not.

Can you wire the Mac temporarily to the same Eero device that the BOOST is wired to, and see if it connects at that point?

I see a “Best Answer” tagged to this thread. Has your issue been resolved? 

Hi, Ok, I turned off the wifi to the MAC and connected the Mac to the ethernet flowing through the Eero system, That did not seem to change anything.  The Sonos app still reports it cannot connect to Sonos but internet, mail, etc, all working with the direct connection.

Sorry, networking is my weakest technology area as it has just tended to work and I may use terms interchangeably which are not truly equal.  Prior to doing this, all devices were on on the same wifi network from the Eero.   I would assume they are still all on the Eero, with the MAC now directly wired to it and the wifi disabled, while the rest of the devices -- ipad, CONNECT, etc., are on the wifi network broadcast by the Eero.

As I should have maybe not turned off the wifi on the MAC, I turned it back on -- same network as all devices in this thread.  I restarted the S1 App and after about 30 seconds I received a white screen with a black check mark that this Sonos App is now connected to your Sonos System.  I clicked “Done” in the bottom right hand corner and that took me to the familiar black screen of “sorry, we can’t connect to Sonos”.  So maybe something changed slightly?  But the result is still that the MacOS S1 app doesn’t appear to be connected to anything despite the first white background message….

@Mykari,
Here is one suggestion to perhaps try (it’s a bit long-winded… ‘sorry’) …

Try following these steps carefully.. and take time to go through the list below. but please note they will ‘hopefully’ only work as long as you have NOT factory reset either of your two Sonos ‘Connects’ - if you have reset both, then the below will not work…

1. Ensure your computer (and any mobiles/tablets) WiFi connection are all definitely running on the eero WiFi  network and not connected to any other WiFi signal. Check the internet is working by opening a page in a web browser and then close that.
2. Power off and set aside both the ‘Boost’ and ‘Beam’
3. Cable one of your old ‘Connects’ to the main eero hub only and power it on.
4. Delete the (gold icon) S2 Sonos App (if installed) on your Mac and/or mobile devices (this is an important step). S2 App is not needed on any device.
5. Reset the (black icon) S1 Controller App on the PC and then reopen the App - agree to all things you see on screen - and choose to connect to "existing" sonos system when prompted or connect to system found on your network and ‘if asked’ to press button on the Connect then do that. Also sign into your Sonos account in the App. Whatever you do at this point do NOT choose the option to create a new system.
6. Hopefully you will now be able to see both your powered on ‘Connects’ in the S1 Sonos App. If all is well then move onto the next step…
7. Next factory reset your Sonos Boost - do NOT cable it to your network. When it’s LED is flashing green, in your S1 Sonos App on a mobile phone/tablet goto "Settings/System/Add Product" and add the Boost to your system. 
8. When Boost setup is complete, power off your two Sonos Connects and now uncable the Connect from your Eero Hub and close the S1 App on your MAC/Mobile device.
9. Now connect your ‘Sonos Boost’ to the eero main hub and power it on (if not on already)... let it settle and connect to the internet.
10. Power on your two Connects - let them settle for a few minutes and then open the S1 App on your mobile and Mac - the two ‘Connects’ should appear in the S1 App.. if all is still okay then continue to the next step…
11. Now factory reset your Sonos Beam and once again when it’s light is flashing Green…. in your S1 Sonos App on your phone/tablet goto "Settings/System/Add Product" and  add the Beam to your system. .. when that’s added everything should now be fully working and all you need do after that, is to add your music library to your S1 Controller on the Mac computer - I assume you know how to do that?

Thanks!  We will try this in the morning-- have a dress rehearsal to get to now.  I appreciate all the support from folks here and will be back tomorrow to provide an update.