Index.php not auto loading WordPress

I’ve browsed the forums for an answer but only seem to come up with .htaccess solutions. I’m on IIS and not Linux so I’m using a web.config. Everything is working as it should, permalinks and such but when I go to my website at https://www.musicatthecorner.com and don’t have an index.html file just the index.php I get a 404 error. Currently I have a static index.html file loaded and then when you click any link on the website it goes to WordPress.

Any help would be appreciated, thanks!