Samuel Sweitzer

For anyone else struggling with this, I made the following solution. WARNING: This requires editing the plug-in’s code directly, which I DO NOT recommend. But I was unable to do this any other way.

File to edit: \wp-content\plugins\publish-to-apple-news\includes\apple-exporter\builders\class-metadata.php : line 61

OLD CODE:

// Add canonical URL.
$meta[‘canonicalURL’] = get_permalink( $this->content_id() );

NEW CODE:
// Add canonical URL.
$meta[‘canonicalURL’] = get_permalink( $this->content_id() );
$meta[‘canonicalURL’] = apply_filters( ‘apple_news_markdown_hyperlink’, $meta[‘canonicalURL’] ); // add apple_news_markdown_hyperlink filter – Samuel Sweitzer 2019-07-16

Also due to the high traffic of our live website once the 502 errors began we have to revert right away, but looking at the logs, the Resource temporarily unavailable error was occurring off and on for three hours before it caused the 502 errors to be visible.