That URL redirects to https://theuniversityclubpodcast.com/feed/ when entered in a feed validator, though when entered in a browser it brings up a message saying that it's redirecting to an external link, which is a web page. This is asking for problems for a start. It does say that rss readers and podcast apps will be automatically redirected, though I'm not at all convinced this is working for iTunes.
However, the real problem is that the feed at that URL has no 'enclosure' tags containing the URLs of your playable media files, and so iTunes will not display them nor Podcasts Connect accept them, even if they manage to navigate to the feed from the original URL.
Your top episode has no text in the 'title' tag, nor any sign of playable media. The second episode's 'content: encoded' tag (which iTunes does not read) contains an iframe with a YouTube URL in it. You can't use YouTube videos in a podcast. The acceptable formats are .mp3, .m4a, .m4v, .mov or .mp4.
I'm afraid it's a case of back to the drawing board.