@sash011 I’m not sure, but maybe your issue is related to this: "Current user not permitted to use Confluence" with OAuth user impersonation on some instances
What I have discovered is that there are some unofficial REST endpoints that are not supported to be used through AP.request(). On most instances, those can still be used through OAuth authentication, but on some instances (running the Free Plan?) this is not possible. I haven’t found any solution for this.