I'm following a few different guides, but the gist is being able to host some static HTML pages using Azure blob storage. Starting I used this guide to set up the blob for web content.
Then followed up by using this guide to add my custom domain name.
We use Cloudflare for our DNS, and I created the CNAME record for the static webpage, as directed in guide 2. In Azure, when 'verifying' the domain, you can't have the CNAME record 'proxied' in Cloudflare. As soon as we 'verify' the domain/subdomain, the content is live, however, you get an SSL error when trying to browse the content with the custom domain.
If I enable 'proxying' on the CNAME record, I then get this message:
So I'm at a loss as to what exactly to do here.


The error code you mentioned indicates that the server is unable to locate the resource requested by the client.
Portal:

Reference:
STATIC WEBSITE NOT WORKING - Microsoft Q&A by Sumarigo-MSFT.