RSS feed works and doesn’t work

None of your permalinks work either:
https://southerncommunityguide.com/press/

Do you have the .htaccess file? Are you running Apache?

Might want to read this:
https://codex.www.ads-software.com/Using_Permalinks

I am running IIS

Well, you can’t use that style of permalink then. Switch the permalink settings back to “Default”.

More info:
https://codex.www.ads-software.com/Using_Permalinks#Permalinks_without_mod_rewrite

You know, I’m so used to running WP on Apache I didn’t even consider that htaccess wouldn’t work on IIS. Doh! Thanks!

If you don’t bother paying a few bucks, you can use iis mod-rewrite or isapi-rewrite. Both enable .htaccess support on iis. One of the vendors has a useful setup guide:

https://www.micronovae.com/ModRewrite/articles/CleanPermalinksWordpress.html