In our Drupal installation there is a menu item for the RSS feed, pointing to path de/rss for the German feed.
This path appears unchanged in the frontend and is invalid, hence results in a 404.
The correct URL is /de/rss.xml or just /rss.xml.
Weird thing is, that Drupal accepts the non-working path, while it rejects the correct ones:
The path 'de/rss.xml' is either invalid or you do not have access to it.
What's going on?
Note: I'm using the i18n module. And when I call /de/rss.xml it gets redirected to /rss.xml.