Issue setting up custom subdomain to proxy branch of Pages

I have setup domain registered with cf (cloudflare) and setup a base pages (in this case napp). The base routing from napp.pro to napp.pages.dev works flawlessly, but when I am trying to route markdown.napp.pro to markdown.napp.pages.dev then it doesn't work. I am deploying via wrangler and all my deployment to the branch (in this case markdown) within the main pages site (napp.pages.dev) are shown as preview. I dont know if that has any issue, but the main site markdown.napp.pages.dev works flawlessly.

I went through the channel for similar issue and read through a couple of posts, but none of those help me understand this better. Any pointer in this regard will be of great help.
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