We open a support case and get these suggestions:

he issue point the service Forms Routing service or the Forms application pool are not running
you must ensure both are running , recommendations are to use a domain account that is a member of the Local administrator group on the machine <--- please read the instructions "carefully

Hope it's useful

Thanks, we are going to also look at how we pointing to our Directory Server path in the installation, it may have been wrong on our end. URL vs. server name.