Try adding /feed to the base URL of the site (https://newssite.com/feed)
If that doesn't work, try one of these:
/rss to the end of the URL. Like this: https://example.tumblr.com/rssfeeds/posts/default to the end of the URL. Like this: example.blogspot.com/feeds/posts/default/feed/ before the publication's name. So medium.com/example-site becomes medium.com/feed/example-siteRepo releases
https://github.com/:owner/:repo/releases.atomRepo commits
https://github.com/:owner/:repo/commits.atomPrivate feed (You can find Subscribe to your news feed in dashboard page after login)
https://github.com/:user.private.atom?token=:secretRepo tags
https://github.com/:user/:repo/tags.atomUser activity
https://github.com/:user.atom