I have the exact same problem. I have reset, delinked, signed out of Deezer, signed back in, spoken to it nicely and it still won't play deezer despite it confirming back that it is playing music on Deezer. Very frustrating!!

Interesting that the speaker works fine with Spotify..... Deezer, this is something at your end.

Now casting isn't working, the speaker makes that 'duh' sound to let me know it's trying to connect, but no content arrives from Deezer. Sorry guys I'm moving to Spotify or Tidal if that isn't resolved soon. 

Same issue for me.

Looks like an expired certificate is the issue: 

https://support.deezer.com/hc/en-gb/articles/4408429766929-Deezer-Unable-To-Connect-With-Some-Devices-

However how come Spotify works fine?

Can Deezer provide us with an update urgently? 

Hello everybody, 

We are having an issue with sound systems with Chromecast built in.

Other users are talking about it here: 

If you could send me a DM with your user ID and the model of your device I will send them to our devs. 

Thanks! 

Any fix for this yet?

Anyone know if the issue is fixed with the LG wk7 model?

Still not working for me.

Canceled my subscription and requested a refund as Deezer offered no help.or possible solution to this issue 

I also canceled my subscription