Sounds like the app is older than the speaker firmware. Update the app. You likely had your speakers configured for automatic updates, and your app got “left behind”.

If the app wont update then tell us exactly what Android version you are using, it could be too old for an app update.

How can I update my Sonos app if I don't have access to my account, system and services/voice?

I have a GalaxyA20.

Thanks

Go to the Google Play store and update from there.

I just checked my Sonos app and there was an update done on March 17, 2023. I started having problems after that update. 

Good grief! 

That’s strange - Sonos indicate the release date as 27th Match - not 17th March.

Try deleting your Android app completely, then go back to the Google store and download a fresh copy, and install it. Be sure to ‘join existing system’ when you get to that prompt. Once you’ve done this, go to Settings> System> System updates, and run that. Once all that is done, you should be able to ‘log in’ to your account. 

Note that account management data is on the manage your account FAQ, in case there’s an issue.

Oh, one more thing, you need to be sure your Android version matches the information on the supported OS for controllers FAQ.

I guess the solution would be to uninstall the app and reinstall it again...

Yes my Android version matches...I have version 11.

UPDATE: I uninstalled and reinstalled my Sonos app and it's working now. I had to reconnect.

Thanks everyone for your feedback...