Due to the way that Spotify works, remix artists, 'featuring' artists, or artists on 'Various Artists' compilations who are credited at the track-level (and not at the release-level) will find the release they appear on in the 'Appears On' section of their Spotify profile.
This section is limited to the artist's top 50 appearances (25 on the mobile app). If the artist has had more than 50 appearances and the release is not showing here currently, it is likely not in their top 50 yet.
Only main artists credited at the release-level will have the release display in the main section of their Spotify profile, as well as have the ability to pitch the release within Spotify for Artists.
In your artist is instead incorrectly mapped on a release, please see the following article: How can I fix artist mapping issues on Spotify?