hey there @user-removed,
when an album or song isn't added, or is removed, it's usually the choice of the artist or label - spotify wants people to enjoy an expanding library of over 30 million tracks but individual copyright decisions aren't theirs to make.
Here's what you can do to get that added:
Hope that helps! ^_^
Spotify won't contact you directly, but I suggest you follow the artist, reach out to the artist and keep your notification settings up to date. That way, you won't miss out 🙂