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.
WP sites/Woocommerce stores in multiple subfolders broken after migration
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
Same webpage on 2 sites (multisite)
I have resolved this issue after reviewing a get_posts() function that was running in a template partial that was not using setup_postdata( $post ) at the start of the foreach and closing out with a wp_reset_postdata() after the foreach had completed. This get_posts() was corrupting the main loop array and causing it to fail on … Read more
How can I change WordPress Multisite “lang”
Server error on multisite installation
Media Attachment Pages Redirect to Media Files After Migrating to WordPress Multisite
Firstly, you should absolutely not modify core files. Ever. Any changes you make to core files can and will be overwritten any time WordPress updates. There are umpteen ways in which WP has been written to allow you to change its behaviour without hacking on core files: hooks, filters, APIs. Use those instead. In this … Read more
If you want to add ?wmc-currency=AUD for all of your product URLs in the sitemap, you can use the wpseo_xml_sitemap_post_url filter: /** * Alters the URL structure for all products * * @param string $url The URL to modify. * @param WP_Post $post The post object. * * @return string The modified URL. */ function … Read more