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I have created a custom post type: register_post_type() and custom taxonomy: register_taxonomy(), but when trying to show the categories made to the post type in the theme single-{post_type}.php they do not appear.

I am using this but without success:

$categories = get_the_category($post->ID);

foreach($categories as $category){
  echo $category->name;
}
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Try using get_the_terms() instead of get_the_category(). The latter is for the default "category" taxonomy only, not custom taxonomies you register yourself. See developer.wordpress.org/reference/functions/get_the_terms

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