RSS feed for comments

The permalinks for my RSS feed for comments on each post are not working. My site’s at https://www.rapp.org.
Any ideas?
Here’s my .htaccess file:
RewriteEngine On
RewriteBase /
RewriteRule ^archives/([0-9]{4})/([0-9]{1,2})/([_0-9a-z-]+)/trackback/?$ /wp-trackback.php?year=$1&monthnum=$2&name=$3 [QSA]
RewriteRule ^archives/([0-9]{4})?/?([0-9]{1,2})?/?([_0-9a-z-]+)?/?([0-9]+)?/?$ /index.php?year=$1&monthnum=$2&name=$3&page=$4 [QSA]
RewriteRule ^archives/?(.*) /index.php?category_name=$1 [QSA]
RewriteRule ^archives/(.*)/(feed|rdf|rss|rss2|atom)/?$ /wp-feed.php?category_name=$1&feed=$2 [QSA]
RewriteRule ^archives/author/(.*)/(feed|rdf|rss|rss2|atom)/?$ /wp-feed.php?author_name=$1&feed=$2 [QSA]
RewriteRule ^archives/author/?(.*) /index.php?author_name=$1 [QSA]
RewriteRule ^archives/([0-9]{4})/([0-9]{1,2})/([_0-9a-z-]+)/(feed|rdf|rss|rss2|atom)/?$ /wp-feed.php?year=$1&monthnum=$2&name=$3&feed=$4 [QSA]
RewriteRule ^feed/?([_0-9a-z-]+)?/?$ /wp-feed.php?feed=$1 [QSA]
RewriteRule ^comments/feed/?([_0-9a-z-]+)?/?$ /wp-feed.php?feed=$1&withcomments=1 [QSA]