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Avoid duplicate indexing in google when hosting in subdomain and using reverse proxy to /subfolder/

I have reverse proxied my webflow blog hosted in sub-domain to sub-folder

Problem is now I have duplicate content and there is a risk of google indexing both my subdomain url and /blog url.

  1. Is there any way to avoid google from indexing the pages inside my subdomain, and index only subfolder pages inside /blog/.
  2. When I am generating the sitemap, it creates sitemap with, but not Best Website Builder | Create A Website & Go Online| Is there any easy way to create sitemaps for subfolder instead of urls from subdomains. Copy pasting manually from sitemap generator everytime a new blog is posted sounds tedious.

Here is my site Read-Only: LINK

I suggest you look at the following resource which explains the problem and provides a solution.
Consolidate Duplicate URLs with Canonicals | Google Search Central

@webdev Jeff, thanks for responding. Any workarounds for the sitemap question that I asked above ?