Problem opening subdomain when using cloudflare

I have a problem with connecting the domain to cloudflare
Unfortunately, the subdomains that I create are not opened. Are there any special settings required?
I have tested the following subdomain for several times, but every time an error occurs when browsing through the browser
[my subdomain](https://dl.acidholic.ocm)

That hostname doesn’t appear to be proxied. The origin server isn’t responding on port 443. I’d recommend checking the IP address and the origin server to ensure it’s configured correctly.


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