Error: The RSS file isn’t working

We tried to get the RSS file for this podcast - https://feeds.grownupsreadthingstheywroteaskids.com/podcast - but it wouldn’t load for us.

array (
  'wrapperType' => 'track',
  'kind' => 'podcast',
  'collectionId' => 890900960,
  'trackId' => 890900960,
  'artistName' => 'Dan Misener',
  'collectionName' => 'Grownups Read Things They Wrote as Kids',
  'trackName' => 'Grownups Read Things They Wrote as Kids',
  'collectionCensoredName' => 'Grownups Read Things They Wrote as Kids',
  'trackCensoredName' => 'Grownups Read Things They Wrote as Kids',
  'collectionViewUrl' => 'https://podcasts.apple.com/us/podcast/grownups-read-things-they-wrote-as-kids/id890900960?uo=4',
  'feedUrl' => 'https://feeds.grownupsreadthingstheywroteaskids.com/podcast',
  'trackViewUrl' => 'https://podcasts.apple.com/us/podcast/grownups-read-things-they-wrote-as-kids/id890900960?uo=4',
  'artworkUrl30' => 'https://is2-ssl.mzstatic.com/image/thumb/Podcasts113/v4/1d/f4/f2/1df4f270-e876-e0af-9c6e-be0e7228c741/mza_8150648301552603636.jpeg/30x30bb.jpg',
  'artworkUrl60' => 'https://is2-ssl.mzstatic.com/image/thumb/Podcasts113/v4/1d/f4/f2/1df4f270-e876-e0af-9c6e-be0e7228c741/mza_8150648301552603636.jpeg/60x60bb.jpg',
  'artworkUrl100' => 'https://is2-ssl.mzstatic.com/image/thumb/Podcasts113/v4/1d/f4/f2/1df4f270-e876-e0af-9c6e-be0e7228c741/mza_8150648301552603636.jpeg/100x100bb.jpg',
  'collectionPrice' => 0.0,
  'trackPrice' => 0.0,
  'trackRentalPrice' => 0,
  'collectionHdPrice' => 0,
  'trackHdPrice' => 0,
  'trackHdRentalPrice' => 0,
  'releaseDate' => '2019-10-07T09:15:00Z',
  'collectionExplicitness' => 'cleaned',
  'trackExplicitness' => 'cleaned',
  'trackCount' => 127,
  'country' => 'USA',
  'currency' => 'USD',
  'primaryGenreName' => 'Personal Journals',
  'contentAdvisoryRating' => 'Clean',
  'artworkUrl600' => 'https://is2-ssl.mzstatic.com/image/thumb/Podcasts113/v4/1d/f4/f2/1df4f270-e876-e0af-9c6e-be0e7228c741/mza_8150648301552603636.jpeg/600x600bb.jpg',
  'genreIds' => 
  array (
    0 => '1302',
    1 => '26',
    2 => '1324',
    3 => '1303',
  ),
  'genres' => 
  array (
    0 => 'Personal Journals',
    1 => 'Podcasts',
    2 => 'Society & Culture',
    3 => 'Comedy',
  ),
)...https://itunes.apple.com/lookup?id=890900960

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