I am trying to publish my Sphinx documentation on GitHub. I keep getting 404 error once deployed (no errors in GitHub actions flagged).

The html works fine when built locally and displayed in browser.

This is my test repo: https://github.com/JKucera-NCC/TestSphinx/deployments

I tried following documentation: https://www.sphinx-doc.org/en/master/tutorial/deploying.html#id5 (and also it’s older version)

I tried following amended versions of it provided in solutions to similar issues, eg: How to self-host Read the Docs using GitHub Pages

I tried using dedicated branch gh-pages for the deployment.

I tried deploying on public personal repo, and on public organization repo.

I played with the deployment branch and location in the setting/pages.

Once I solve other specific issues, I always end up with the same error page:

I would appreciate any ideas on what to try next.