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Hi again! I hope you’re doing well.
I should make a dedicated KB article about this — we get this question about 5 times a year. This is what it would say:
https://projectdmc.org/support/topic/why-4-sitemaps/#post-17074125.
Briefly: We added the /sitemap_index.xml endpoint to support misconfigured hosts that cater to Yoast SEO. If you can access /sitemap.xml, your website is configured correctly in this regard, and you can ignore the sitemap_index one.
I hope this makes sense. Feel free to follow up if you have any more questions. Cheers!