External app using wp-load on subdomain

I think that’s getting triggered by wp-load being unable to identify which blog you’re on at load time. I’d try define( ‘SITE_ID_CURRENT_SITE’, 1 ); define( ‘BLOG_ID_CURRENT_SITE’, 1 ); before you include wp-load, looking up the correct IDs for domain.com/app/ from your wp_blogs table.

WordPress Multisite Sub Domains Admin Panels 404 Error

To clarify my comments (since comments don’t lend themselves to code blocks), you should only be using the .htaccess rules that apply to your particular WordPress installation. I’m assuming in this answer that you’re using WordPress greater than 3.5 (the current release as I write this is 6.7), and your question shows Subdomain Multisite. Thus, … Read more

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