Missing previewURL

[Larson2]

Is there a reason why so many tracks are missing previewURL? We are not getting previewURL for like 70% of the songs.

For example, adding the "Happier than Ever" song by Billie Eillish and playing the 30 second preview works on Tinder. But when I add this song to our app, it doesn't play the preview and just goes into the Spotify app.