Can you post a screenshot of the notification?

Have you actually tried checking compatibility, just once? I suspect this will then tell you that your C:A is incompatible and give you the option to keep everything in S1, among other things. 

I think it would then stop giving you this message.

I am reasonably confident about that but not 100% sure. 

Btw it isn't ridiculous that your older C:A cannot join S2. The whole point of splitting into S1 and S2 was to keep the older devices out of S2 so that their extremely limited memory no longer limited development. 

I have the same problem.  I have 5 devices that are S1 and one that is S2.  I have no intention of upgrading to S2 and want the notifications to stop.  Very annoying.

I have the same annoying issue.  I believe it is programmed to happen every 24 hours.  For those of us that cannot upgrade or do not want to its so very annoying.  Sonos, please give us the option to turn this notification off!

Go to your profile on the Sonos website and turn off notifications.

Same, getting very annoying!

Try resetting your S1 app (in mobile app this is under Settings,  App Preferences). Then connect to existing S1 system.

Do you have an S2 system and app installed as well, or just S1?

Guys, In the Sonos app go to ‘System → Compatibility Check → Learn More → Continue Using S1 → Confirm’.

That's done it, been a couple of days now! Thanks a lot.

Personally I wont buy any more Sonos product after their ridicolous marketing of new products, with hiding the possibility to deactivate the very annoying notifications popping up.... :-(

I do not see the Compatibility Check option under Systems on my iPhone on my iPhone. The actual location is listed below.

The Correct Location is System - System Tools - System Compatibility - System Compatibility Check

Thanks, that did it for now. The silly thing is I have done a compatibility check online for at least 5 times (after clicking the link in the notification). Then the notification also disappeared, but so far it’s always come back. I hope this time it will stay away (and still hope sonos will simply make the s2 app compatible with older hardware, just without the features that wouldn’t work on older hardware). 

This no longer works, at least not in iOS 14.4 on my iPhone. The nag message is there and will not go away. How about it, @sonos how do we clear this message?

Arrrgggghh, it would help if I could actually open the S1 Controller App!!!

I have Sonos Play 1, 3 and a new Sonos Boost & Sonos Move on my S2 App. My Sonos Play 5 has dropped off the system. The S2 App finds the device but keeps telling me to “Download the S1 Controller” Which I do. 

When I open the S1 Controller, it immediately has a pop up with options: 

Open Sonos 2 App

more Options

Learn More.

I am bouncing back & fourth like a fiddlers elbow!

Any help to sole the issue so I can add my geriatric Play 5, would be really helpful. 

Thanks

Hi.  Which type of device are you trying to do this on? Phone? Desktop?

on IOS Iphone 12 Pro