Note that github has an API limit of about 60 requests per hour for unauthenticated users. github-fetchdir will use one API call per directory or subdirectory, so it will not be able to download a ...

What is the feature you are proposing to solve the problem? With the introduction of the new Node.js permission APIs, we could enable fetch on the file system under an option, such as allowFileUrl: ...

If the issue is on Google's end and the sitemap file is accessible and technically fine, then sometimes changing the URL and filename of the sitemap file might do the trick.