Subdomain of website for Github pages project

After more trial and error, the answer seems to be

  1. The Github custom domain should indeed be matrix.jeti.io
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  2. I did not need the apex records. In fact, Github emailed me discouraging it. So I deleted the apex records.

  3. In OVH, I added a DNS CNAME entry like this:

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The thing that was confusing me is that I thought that the CNAME entry needed to have a link to the original Github pages WITH the project name jeti.github.io/matrix. That was wrong. The target is simply jeti.github.io. (Note the period on the end).

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