If your Sonos isn't connecting to Deezer, the most likely causes are incorrect login credentials, network issues, outdated Sonos software, or a problem with Deezer's authorization process on your Sonos app; try checking your Deezer login details, restarting your router and Sonos devices, updating the Sonos app, and re-authorizing Deezer within the Sonos settings. 

Troubleshooting steps:

• Check login details: Ensure your Deezer username and password are correct when adding the service to Sonos. 
• Network connectivity: Verify your Sonos and phone are connected to the same Wi-Fi network. 
• Restart devices: Reboot your router and all Sonos devices. 
• Update Sonos app: Check for available updates in the Sonos app and install them. 
• Re-authorize Deezer: Remove Deezer from your Sonos services and re-add it, ensuring you log in properly. 
• Check for known issues: Check the Sonos community or Deezer support pages for any known issues related to connectivity. 

Specific things to try:

• Clear cache and cookies: Try clearing the cache and cookies on your Sonos app. 
• Check region settings: Make sure your Deezer and Sonos region settings are aligned. 
• Contact support: If the issue persists, reach out to Sonos customer support for further assistance. 

I might be wrong, but it looks like that you are trying to use Deezer Connect and want to play your music while using Deezer.

You can’t use Deezer to stream music to your Sonos speakers. You have to use the Sonos app.

Because you wrote that the music plays on your phone and not Sonos, that’s why I think that you are trying to use Deezer Connect.

So, start the Sonos app, select Deezer and get ready to play!