Pushed a new release for the Drupal ActivityPub module fixing a bunch of issues since y'all now became so active the last two weeks :)
Even though it's alpha, it has an upgrade path as my instance needed the updates. Please check the release notes in case you upgrade too! https://www.drupal.org/project/activitypub/releases/1.0.0-alpha14
Have you written a response to this? Let me know the URL by sending a webmention.