RSS not working in Internet Explorer

Basically, when I try to add the blog’s feed
(https://www.irismin.org/wordpress/wp-rss2.php) to my RSS reader, it says 404
– file not found. The strange thing is when I put the address into my
Firefox or a Safari browser it finds it ok but when I put it into Internet Explorer I
get the 404 error. What is wrong?

Blog location: https://www.irismin.org/wordpress/