Recently there have been numerous reports that Spotify Connect is not working on 3rd party devices like wireless smart speakers, multiroom speakers, sound systems and receivers.
It's either possible to connect to the speaker using the Spotify Connect picker, but songs cannot be played and playback cannot be controlled, or the speakers appear grayed out and cannot connect at all.
We are aware that this issue has been going on for quite some time now. Thanks to your reports and immense help in troubleshooting this, we are happy to say that this should now be fixed. The information provided from members of the community greatly helped the tech teams from Spotify. They worked together with different speaker manufacturers over the last few months in order to pinpoint what was causing this connection issue and were able to sort it out.
If you're still having issues playing music on your sound systems via Spotify Connect, we recommend the following:
Check if there are any firmware updates available for your speaker and install them.
Reboot your router and re-connect all devices to the network.
Alter your router's DNS to 188.8.131.52.
Don't hesitate to reach out again if the issue comes back! We'll do our best to get on it right away, so that you can enjoy your music.