Sitemap is HTML - error when submit sitemap to google search console

I have used the yoast SEO plugin for sitemap generating when I submit the URL of the sitemap_index.xml file to google search console it says “Your Sitemap appears to be an HTML page. Please use a supported sitemap format instead”

I also try multiple online sitemap generaters but these also show the same errors.
The sitemap file is 100% XML but don’t know show this error. please help me to fine solution.

My website sitemap URL is -



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