Since Spotify no longer allows playback in DJ software like Rekordbox, there's a quick workaround for playing your favorite playlists in Rekordbox.
Rekordbox is compatible with popular music services, such as TIDAL and SoundCloud, as well as Beatport and Beatsource. And the best part is: Soundiiz, too.
With Soundiiz, you can quickly transfer your Spotify playlists to TIDAL and these other streaming services. Once done, connect your TIDAL (or another supported service) to your Rekordbox, and you will see your favorite playlists listed there!