My RSS feed says “This feed no longer exists” !??

Hello,

at this site: https://www.themarketingmother.com when clicking on the rss ‘Subscribe’ button (presently hidden by ads blocks, but still clickable the tiny bit still showing on the right of the navbar) the feed says: “This feed no longer exists”. It was working because I subscribed, but I was fiddling around customising the theme and I also changed the navbar image, and then it was not working.

I have reuploaded the original theme without any modifications but it still says the same.

How can I get the rss feed to work again?

Thank you for your time.