Use WP Discourse to publish posts from Wordpress to Discourse

Wiki Administrators
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I am trying to set different categories for different custom_post_types, the code below selects the correct category in the Wordpress admin. However, on publishing to Discourse, the category isn’t set there (and defaults to uncategorised)…

Maybe I am missing something obvious?

// WP Discourse set CPT forum categories for CPTS
 
add_filter( 'wp_discourse_publish_categories', 'radhr_filter_categories_policies', 10, 2 );
function radhr_filter_categories( $categories, $post ) {
	if ( 'policy' === get_post_type( $post ) ) {
		$output = [];
		foreach ( $categories as $category ) {
			if ( 'Policies' === $category['name']) {
				$output[] = $category;
			}
		}
		return $output;
	} 
	
	elseif ( 'guide' === get_post_type( $post ) ) {
		$output = [];
		foreach ( $categories as $category ) {
			if ( 'Guides' === $category['name']) {
				$output[] = $category;
			}
		}
		return $output;
	}
	
	elseif ( 'post' === get_post_type( $post ) ) {
		$output = [];
		foreach ( $categories as $category ) {
			if ( 'Blogs' === $category['name']) {
				$output[] = $category;
			}
		}
		return $output;
	}

	return $categories;
}