Just confirming what everyone else has said on this thread. Due to Spotify’s decision to no longer be playable through any 3rd party DJ app, this service can no longer be accessed through djay. This has actually been the case since July 1, 2020. You can find our old Community post about this here:
djay currently offers several streaming service options that provide millions of songs and/or videos for you to play and mix in djay, including TIDAL, SoundCloud, Beatport Streaming and Beatsource LINK. Hope one of the other options might work for you.