Add New Directory Listing Error

I am getting an 404 error message when trying to create a new listing on my website. The page redirects to https://aaie.net/?page_id=5538 after I click add new listing.

I have ran the plugin conflict test and it the problem still persists.

Support access is granted.

I'm having a similar issue on this site as well and opened a ticket but still have not gotten a working response: https://premium.wpmudev.org/forums/topic/add-new-directory-listing-produces-a-404-error#post-1012733