When you create and/or schedule a report generation job it fails to run.
In the failure, it shows the service account credentials. This account is restricted from being logged in to.
So the password for this account in CCS for Scheduled Job Management is not able to be set.
This issue will be fixed in the next release 12.7 of CCS.
For a workaround, either specify the Service Account credentials in the Admin - Scheduled Job Management section.
Or you can right-click on the job and "schedule" the job. This will allow the job to run as the currently logged-on user.