.htaccess 301 redirect index.php, index.html in subdomain

I have this page for a client:

But when I use:

the page isn't found. I wish to use .htaccess to do a 301 redirect from

I tried this:
RewriteRule ^index.php$ http://irrevocable-trust.ultratrust.com/ [R=301, L]

But it doesn't work.
I have this in the same .htaccess file for the subdomain like:
RewriteRule ^intentionally-defective-grantor-trust.html$ http://irrevocable-trust.ultratrust.com/irrevocable-trust-agreement.html [r=302]

and it works. So I don't know why this doesn't work:
RewriteRule ^index.php$ http://irrevocable-trust.ultratrust.com/ [R=301, L]

Thank you,
Victor KimuraSEO, Web DeveloperAsked:
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You need to use custom error handler for 401 or 403. A rewrite will not apply to a direct access page. The 403 overwrite handler will effect every access to a non-existent url

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Simple 301 redirect accessing a page to a newwebpage.

RewriteEngine On
Redirect 301 /mypage.htm http://newwebpage.com
Save the file and upload the .htaccess file to the root of the domain that hosts the old page. This will do a permanent redirect the page to the newwebpage.com and get the advantage of old web site ranking as well.
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