Yoast Seo - sitemap Issue

[demytech]

[Website URL] (https://demytech.rf.gd/)

(please specify the URL of the site on which you are experiencing the problem)

Error Message

404 Not Found

The page you were looking for could not be found!

Other Information

when I tried to submit the sitemap to the Google Search console it redirected me to the error page for the infinityfree
I am using the Yoast SEO plugin
can you help me, please?
I really appreciate any help you can provide.

[KangJL]

No issue

[demytech]

the issue is in the sitemap URL which is:
https://demytech.rf.gd/sitemap_index.xml

it redirects me to the error page and doesn’t let me see the sitemap for my website.

[demytech]

also when I tried to add the sitemap to Google Search Console it gave me this error