How to add Apple Podcast token to claim existing show?

I need to claim a duplicate show on Apple Podcasts in order to take it down and using a token from them is what they are recommending. How do I do this in PodLove?

Correct, this feature is not implemented yet. However you can adapt the following code snippet to achieve the desired result:

<?php
/**
 * Add Apple Podcasts verification tag to RSS feed
 * 
 * This code adds the itunes:applepodcastsverify tag to your podcast RSS feed.
 * This tag is used by Apple Podcasts to verify ownership of your podcast.
 * 
 * Replace 'YOUR_VERIFICATION_TOKEN' with the token provided by Apple Podcasts.
 */

add_action('podlove_rss2_head', function ($feed) {
    // Replace 'YOUR_VERIFICATION_TOKEN' with the actual token provided by Apple
    $verification_token = 'YOUR_VERIFICATION_TOKEN';
    
    // Only output the tag if a token is set
    if ($verification_token && !empty($verification_token)) {
        echo "\n\t".sprintf('<itunes:applepodcastsverify>%s</itunes:applepodcastsverify>', $verification_token);
    }
});

If you are not sure where to put this code, I recommend Code Snippets – WordPress plugin | WordPress.org

Thank you! Can this feature be added to the backlog?

Sure: Add support for `itunes:applepodcastsverify` · Issue #1558 · podlove/podlove-publisher · GitHub