RSS Feed Issues

Since Yoast handles our RSS feeds I figured this issue is related to the Yoast.

In the past, when I’ve entered a feed URL an actual page displaying the posts in the feed would show up.
Now, when entering the feed URL I’m prompted to open a plain text document.
Here’s the URL–https://samdamico.com/original-photography-and-excellent-photography-courses-and-classes/photography-and-photography-class-related-blog-posts/feed/

I’ve tested the URL in a feed validator and it appears to be a valid feed. https://validator.w3.org/feed/check.cgi?url=https%3A//samdamico.com/original-photography-and-excellent-photography-courses-and-classes/photography-and-photography-class-related-blog-posts/feed/
In addition I’ve had my posts related to this category/feed, and it’s child categories, diplayed in the footer of ny websit, but my most recent posts, dated 12/9/2019 have not been pulled in.

Any help that you can provide would be appreciated.

Thank you.

The page I need help with: [log in to see the link]