Best way to convert two single WordPress sites into Multisite network with shared user base

To me the best way would be to: Leave the ecommerce site intact since it’s where all the important content exist. Enable multisite on ecommerce site. See official documentation: https://codex.wordpress.org/Create_A_Network Export everything on the private site (Tools – Export – All content) Import it on a new site created on the new network.

WordPress multisite with subdirectories always redirects to mainsite

This is the .htaccess I used for multisite: RewriteEngine On RewriteBase / RewriteRule ^index\.php$ – [L] # add a trailing slash to /wp-admin RewriteRule ^([_0-9a-zA-Z-]+/)?wp-admin$ $1wp-admin/ [R=301,L] RewriteCond %{REQUEST_FILENAME} -f [OR] RewriteCond %{REQUEST_FILENAME} -d RewriteRule ^ – [L] RewriteRule ^([_0-9a-zA-Z-]+/)?(wp-(content|admin|includes).*) $2 [L] RewriteRule ^([_0-9a-zA-Z-]+/)?(.*\.php)$ $2 [L] RewriteRule . index.php [L]