Feeds from host

That’s the code to be included in a .shtml file. WP uses .php files.
You should use proper php include – if it’s possible.
Note: if you want to include them in a post or Page you will have to install one of the plugins that make it possible, phpexe or runphp.

https://www.php.net/function.virtual

Thanks Kaf!!! I just tried it and it works.
I didn’t realize there was a PHP equivalent for that.

Having been on the SSI and Perl side of web development for several years, I’m often amazed by the number of equivalents I stumble across in PHP. :)