I made a .htaccess in an addon domain, which successfully hides the wp-admin folder:
# Hide wp-admin
<ifModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{HTTP_USER_AGENT} !MagicString
RewriteRule ^wp-admin/.*$ - [R=404,L]
</ifModule>
Now I'd like to move this to the root domain's .htaccess so it hides all the wp-admin folders on all addon domains. But try as I may, it ain't working. What am I doing wrong?