Multisite with one Mapped Domain htaccess problems

Hi I’ve got a bit of a problem as I can’t seem to get this working..

This does not work for the map domain – it causes a 500 error:

RewriteEngine On
RewriteBase /main/
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]

.. But all the other subsites work.

If I use the following htaccess:

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]

It will cause the mapped domain to function properly but all the rest of the subsites, including the parent site will throw Error 404s.

Interestingly, I turned off pretty permalinks for the mapped domain and used the default WP htaccess code above, and it worked – not the ideal situation.

My guess is that it’s a permalink issue? I’ve done all the steps to refresh/reset the permalinks. I’ve deactivated all the plugins and tried again without success.

Currently the entire network is installed in a subdirectory. Will this cause issues?

Do I need additional htaccess codes in there?

Something that may be worth noting is that this mapped domain was actually an imported/cloned site from a standalone install.

Thank you!