RSS feed not populating any articles into the Instant Article Library

Hi There!

I have no articles in my Instant Article Library. I have configured the plugin per the setup guide. I added the instant-article feed on Facebook Production RSS Feed box. I have gone back to my blog posts and made small updates to the content to generate fresh update dates and still no articles at all in my Instant Article Library. Not the empty article error I read about in other threads… just no articles at all. Thanks for your help. ??