RSS Feed doesn't actually Trigger

Hi, I’ve setup a flow where RSS is the first piece. I can test every piece in the flow and it works well when I do it manually. I can even run the entire flow manually and it shows up on my WordPress site.

The problem I am having is that I thought automation would occur once the RSS feed has changed (the RSS feed does get updated several times a day) . I thought it would be automatic but I’ve left the flow published and active for a couple of days and checked the Runs, and there is nothing there. I’ve checked my WordPress and nothing has been added.

What am I missing? How do I automate a flow so that when the RSS changes it gets posted to my site?