It appears that Sonos Staff are investigating some reports of this issue affecting some users… see this earlier thread:

I’d try resetting the Sonos App as mentioned in the thread.

Also see this link:

https://support.sonos.com/en-us/article/reset-the-sonos-app

Dozens of threads on Reddit and here. It’s a bug. Sometimes force quitting the app will work. 

Hi @mdwilk45 

Welcome to the Sonos Community!

Although there is an issue making some people need to sign in repeatedly, this is not what is affecting you.

If you are signing into the Sonos app using the email that you have used to post here, that is not the email that your system is registered to, and therefore not the email you should be signing into the app with - the email you are using here has no speakers registered to it. Please note that you can sign into the Sonos app using any valid Sonos account, but only when signed in with the account to which the system is registered do you have permission to configure the system or see Recently Played items.

If you have another email that you use, please try logging into the app with that. If you do not, you may have accidentally registered your system to an email address with a typo in it. If this seems to be the case, please try Settings icon » Manage » Transfer System Ownership » Continue.

I hope this helps.

I have this is issue. I have removed the app and reinstalled but no change. I’ve had Sonos for 20yrs and now it has become a total pain. Is there a solution? I am using my login to the new Sonos App, not Sonos 1 app that I am not using. I notice that in the website it says “email not verified” but that is also impossible to fix.

Hi ​@music_rik 

Welcome to the Sonos Community!

The email you are using to log in and post here has no speakers registered to it - if you are logging in to the app with the same email, it is the incorrect email address to use.

I have requested that you be sent an email address verification email to that address (and have just now been told it has been sent) - please keep an eye on your inbox and spam folder.

I hope this helps.