Welcome to the Community and thanks for reaching out about this here.
Unfortunately, this is something that Spotify doesn't have control over as the availability of music on the platform is determined by the artists and their music label or distributors. For instance, some music is or becomes only available in certain countries, while access is blocked to others.
For more details on this, it'd be great to take a look at this Support article.
Hope you found this info useful. Let us know if there's anything else we can help with!
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