Want to remove noindex tag from the HTTP header:

I'm using instance on AWS. The web server is open lightspeed WordPress.

I want to submit my site map to Google site all of my pages and post can be crawled by Googlebot but the site map issued by Yoast plugin is not indexing by Google. Google says "remove the noindex HTTP header"

My site's sitemap is:

What you really want is the pages listed in the sitemap to get indexed. The noindex header on the sitemap won't prevent that. Instead of inspecting the sitemap URL itself in Google Search Console, inspect any of the URLs that are listed in the sitemap and verify that they are allowed to be indexed.