Artist Identifiers are unique codes that link to a specific artist page on a DSP. Artist Identifiers ensure that releases are mapped to the correct artist page.
Please note that Spotify only ingests identifiers for organizations enrolled in their Preferred Partners program. If you are not a Preferred Partner, Artist Identifiers that you add in FUGA Next will be delivered but not ingested by Spotify.
You can learn more about how Artist Identifiers work here:
Where do I find the artist ID on the DSPs?
How do I add artist IDs in FUGA Next?