Reports: Rebuild RSS Feeds
RSS Feeds for IdeaScale communities are cached for high-performance. The Rebuild RSS Feeds user interface in the admin tool can be used to regenerate the RSS feeds for both the ideas and the comments.
First navigate to Reports » Data Management
» Export Data » Rebuild RSS Feeds 
Next click 'Rebuild RSS Feeds', which will regenerate
the RSS Feeds
A message will appear saying
'The RSS Feeds have been rebuilt as of (Date)'.