how to add custom taxonomy terms to main rss feed WordPress 4.4?

I’m wondering how to add custom taxonomies and their terms to the main RSS feed in WP 4.4.

I’ve tried:

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function myfeed_request($qv) {
    if (isset($qv['feed']))
        $qv['taxonomy'] = array(
            'relation' => 'AND',
            array(
                'taxonomy' => 'Issues',
            ),
            array(
                'taxonomy' => 'Reissues',
            ),
        );
    return $qv;
}
add_filter('request', 'myfeed_request');

But it’s not expressing any of the custom taxonomy terms in the RSS feed when i go to http://www.example.com/feed The names of the custom taxonomies are “Issues” and “Reissues”

I’m at a total loss. Thanks for your help!

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