This isn’t the answer to my question, but ended up being the workaround I used.
Settle for a subdomain multi-site.
I changed it over to mu.site.com/ and sub-site.site.com/, updated htaccess to work for a subdomain install and everything just started working. I’m not sure why the subdirectory multi-site installed on a subdomain caused an issue, but it did!
Related Posts:
- Using one media library for a multisite network with WordPress 3.5 media library
- Upload path/URL weirdness for the main blog of a multisite/network setup
- Organize uploaded media files
- Don’t allow access to wp-admin but allow admin-ajax requests to be fulfilled on frontend?
- Uploading Images to Multi-Site Causes Failure to HTTP Error
- Fixing media links after importing to multisite
- How to use JSONP to make AJAX request to different site on network
- Cookie nonce is invalid – Multisite
- How to stop unlink images when remove a site or user
- wordpress multisite subsite rewrite rules not working for videos
- Multisite media library uploads broken images
- Changing path for media upload folder in wordpress multisite
- Multisite – Images often getting uploaded to the wrong month directory
- My Media Library is broken across all my subsites
- Copying media from multisite subsites to main website
- Where to set individual blog quotas?
- Wait ajax to complete before continue loop
- Automatically Insert Into Post when uploading Media
- Unable to execute Ajax request, status code 400
- How to migrate post media from stand-alone to multisite build
- Load media from another URL on a multisite install
- Showing All Media from All Multisites
- ajax returns -1 in multisite sub domain
- New wordpress uploads are broken
- Multi site and media uploader
- Anyone figured out how to use WordPress MultiSite with Domain Mapping & SSL?
- What do I need to do to convert my MultiSite from HTTP to HTTPS?
- WP Multisite development with Mamp Pro and wildcard subdomains, not really working for me
- SSL wildcard issue for wp multisite subdomains
- How to set configuration options for particular sub blogs?
- Perform action on WPMU blog deletion
- Changing Multisite themes on mass
- How to upload images manually to wordpress?
- MU domain mapping login issue
- Sitemap Plugin for WordPress Network
- How to make WordPress use new Upload Path settings in Multisite Setup
- WPDB Multiple site’s posts and get featured images
- Using WP CLI to set options in WP Multisite
- Import a regular WordPress blog into a MU installation
- Basic analytics across WordPress Multisite network [closed]
- Ideal WP multisite server setup for up to 1000 sites?
- WordPress 3.8.1 Multisite blog slug problem
- Retrieving JSON data in ajax request from media uploader
- How to make wp-signup.php a 1-step process [closed]
- Transients API and multisite
- Multiple Multisite networks on the same domain?
- How the mu-plugins Folder Works in a Multisite Installation?
- Get Permalink of Network Blog Post
- What is the best practice to get a site from local to online?
- WP Multisite – domain mapping to domain.com and separate site to domain.com/help
- How i can get blog info using site url in multi-site
- Embedding screencast.com Videos in WordPress Multisite
- Mapping subdomain to point to sudirectory site in WordPress Multisite Network
- Multiple multisite instances connecting to the same database
- Multisite multidomain
- Media is not attached after import
- Notice bar at frontpage for multisite
- Syncing content in Multisite. Possible?
- Query to import data from one MultiSite table to another (pages/sub-pages)
- Apache Site Aliases & WordPress Multisite
- Single sign on for several website domains
- How to create a Multi-Network subsite?
- Hierarchy in multisite
- Create default pages in wordpress multisite
- Remove superadmin role from the “change role to” menu in user listing
- use get_theme_mod from all sites in network
- Generate HTTPS Urls in multisite
- Replicate network plugins without having to configure it for each subsite?
- Why are “numeric only” names disallowed when creating a new site in a WordPress multisite network?
- How to organize my js files
- Installing multisite network on a bluehost addon domain
- If statement in wp-config.php, is it possible?
- How do I correctly configure my AMPPS localhost to use subdomains for multisite?
- WordPress Multisite URLs and Multiple Updates
- Multisite switch to blog
- WordPress multisite, allow non super admins to create sites
- How to Force WWW. in Domain With WordPress MU Domain Mapping Plugin?
- How does WP decide how to evaluate database integrity
- Fastest way to fetch posts across a multisite
- Interchanging WordPress Multisite primary site
- Redirect custom post type across multisite network
- Multisite Equivalent of `register_setting`?
- Admin users not able to see network menus
- Timber\Image an image from another site in network
- WordPress Multisite keeps redirecting to HTTPS
- wordpress.mydomian.com 404 Error
- Assign user to belong to a subsite in Multisite instance
- Multisite – SMTP not working on other network sites
- What could cause wpmu_create_blog to throw “Already Installed” Error on multisite?
- User Roles in multisite – odd behavior
- Using multisite, how can I get two different sites on the network to have different active themes?
- For a multisite WordPress site, how can I access a tag feed across all subsites?
- What structure should I chose for my website?
- Can WP multisite manage multiple ccTLDs
- Should i use multisite for my business?
- WordPress Multisite redirect loop
- Split a Multisite Into Single WordPress Websites
- WordPress Multisite Subsite WP admin not working
- Multiple WordPress sites on one hosting [closed]
- wordpress multisite with already existing subdomain