But it only works on one single subfolder within the website.
All other folders within the site continue to return blank for
AUTH_USER. How is that even possible? I tried copying the folder
that works to another location and it didn't work. AUTH_USER still
comes back blank.
Keep in mind that permissions like these can be set all the
way down to the file level. Just because a folder is set up with
certain permissions does not necessarilly mean that all of the
files within that folder are set up that way.