May I suggest below article for more information about this error:
In your robots.txt file I do not see any entry which could allow Google to fetch your sitemap.
Either define again (duplicate) User-Agent: * and Sitemap: path or define manually User-Agent: Googlebot (multiple).
Otherwise, do you see any blocked or challenged events at Firewall tab → Firewall Events from Cloudflare dashboard for your domain name?
Are you using any custom-made Firewall rules like country blocking, or maybe Bot Fight mode is enabled, etc. at Cloudflare dashboard?
You do have some syntax error, duplicate “content” attribute?:
<meta name="robots" content="index,follow" content="max-image-preview:large" />
Should be:
<meta name="robots" content="index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1">