Change WordPress user roles and capabilities › Forums › Bug Reports › Contributor Role Unable to Submit Post for Review › Reply To: Contributor Role Unable to Submit Post for Review
28/02/2018 at 01:29 #4632
Try to deactivate all plugins and re-test. If that will help, activate plugins back one by one to isolate a reason of a problem.
Generally WordPress returns -1 with 403 HTTP code for not authorized AJAX requests.