.htaccess or mail autodiscover

[dotcomUNDERGROUND]

I am following instructions provided here: https://docs.directadmin.com/other-hosting-services/email/autodiscover.html

I am running OpenLiteSpeed. Does the provided .htaccess code work with OLS?
I have created the .htaccess file with file manager. Also have restarted OLS.

But visiting the autoconfig domain (autodiscover.hostname.com) gives 404 without index.html and shows the index file with index.html

RewriteEngine On
RewriteCond %{REQUEST_FILENAME} -s [OR]
RewriteCond %{REQUEST_FILENAME} -l [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^.*$ - [NC,L]
RewriteRule ^.*$ autodiscover.php [NC,L]