Custom Post Type Not Added to Feed

For some reason, the website does not include a any posts in a specific custom post type (sermon) in the feed. Here is the feed: https://thebridgeonline.net/feed/podcast/ (semi-related: Powerpress says this channel has 749 episodes, and the total number of posts, excluding the my specific CPT, is way lower than that).

To make sure everything is in good order, I worked on a single sermon post – https://thebridgeonline.net/sermons/the-heavenly-cry-of-the-redeemed-2/ – and I made sure all the Powerpress settings are the same like on a page that does appear in the feed – https://thebridgeonline.net/6561/

To make sure this is not a caching problem, based on other support topics around here, I created a new Podcast Channel and I configured it to include only the sermon CPT – in the channels edit screen it is shown to have 0 episodes, and the feed contain no posts: https://thebridgeonline.net/feed/sermons-new/

Also, based on other similar topics posted here, I also checked the CPT registration, and the respective function contains the necessary values:

...
'capability_type' => 'post',
'hierarchical' => false,
'has_archive' => 'sermon_archive',
...

I also went over all the general troubleshooting list, and I did not find any relevant applicable item on it. Any other suggestions? How can I get that specific CPT post into either the general feed, OR the specific channel feed, OR both?

The page I need help with: [log in to see the link]