I have exactly the same problem. Perhaps it’s a temporary issue? Happens for me with the example from the docs as well:

curl \
  -H "Accept: application/vnd.github.v3+json" \
  https://api.github.com/repos/octocat/hello-world/actions/runs/42/logs

What I also found is that you can go to the job URL and query the sha, job id parameters to then get the job log as said here:

<a href="https://github.community/t/any-way-to-determine-url-to-raw-logs-of-github-actions/18227">Any way to determine url to raw logs of github actions?</a> <a class="badge-wrapper  bullet" href="/c/code-to-cloud/github-actions/41"><span class="badge-category-parent-bg" style="background-color: #6a737d;"></span><span class="badge-category-bg" style="background-color: #2188ff;"></span><span style="" data-drop-close="true" class="badge-category clear-badge" title="Discussion and questions about GitHub Actions—automation for all of your development workflows, now with world-class CI/CD.">GitHub Actions</span></a>

Hello, I would like to provide link and possible line location of raw log file url that is found in the “View raw logs” pull down menu on the Actions  page. Is it possible to assible this link from GITHUB env variables during the action run?

Bad news, this method only works if a user is logged in in the browser. What a disaster, why did the GitHub devs made it so clumsy?!