Indexing request rejected

On Google search console, when trying to inspect my URL, I receive the following message:
Indexing request rejected
During live testing, indexing issues were detected with the URL
Under “coverage” I get: URL is unknown to Google
Sitemaps: N/A

When I check the sitemaps it has: Couldn’t fetch
Although the sitemap is there:
https://insanity.expatika.org/sitemap_index.xml

Thanks a lot for your help,
Taly

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