I had this issue a while back. After a lot of discussion with Deezer support it turned out that I could not use MY old iPhone as for some reason Deezer recognized my new and old iPhones as the same device. Having said that when using a different device I still could not get the Connect feature to function as advertised. Deezer needs to release a paper Connect function like Spotify or Tidal.

Thanks for your reply. Yes I get that would make sense.