A "Session terminated due to authentication failure" error means the integration with your property management software has been interrupted by either changing or resetting the Blue Moon password.
If you are able to login into your account at www.bluemoonforms.com, then you need to contact your management software (Yardi, MRI, Onesite, etc.) and provide them the correct Blue Moon login information.
The login information currently stored in your management software settings does not match the correct Blue Moon login information and needs to be updated.