I was bootstrapping WordPress in ics.php by including wp-blog-header.php (which usually works for me), but after changing it to include wp-load.php instead, the files generated were no longer not being found.
I was bootstrapping WordPress in ics.php by including wp-blog-header.php (which usually works for me), but after changing it to include wp-load.php instead, the files generated were no longer not being found.