It seems that this song is currently not on Spotify. As of why, I don't really know the true reason. The label / artist knows. 🙂 They may not have reached the agreements, or have decided to do something else with the song, or there are third reasons.
You can try to contact the artist or their label to ask when they plan to be on Spotify.
You can also open this form and provide Spotify with feedback. Note: filling this form is not going to guarantee you'll immediately see the requested content on Spotify.
Lots of new content is added every day, hopefully your favourite tune will end up here soon too!
Hope that helps! 🙂
SebastyRock Star 18
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