I am seeing the below notice on post edit pages (wp-admin/post.php?post=XX&action=edit), on the apple news UI and in my error logs when inserting a post.
This bug is in version 1.3.0 and 1.4.1
Notice: Undefined property: stdClass::$message in … /wp-content/plugins/publish-to-apple-news/includes/apple-push-api/request/class-request.php on line 289