My first guess is that you might need to be aware of a minor difference between how the scheduled jobs are setup/listed in the task manager. It depends if this is a scheduled deployment or a scheduled scan as to where the scheduled job should show up in the task manager.
Scheduled Deployment - Will show listed in the task manager under each individual target system where the scheduled deployment is set up.
Scheduled Scan (including scheduled scan with autodeploy) - Will show up listed under the console system within the task manager.
This info is also in the document Locating Scheduled Tasks.
If this isn't the issue it might be best to open a case direct with support to investigate the issue more thoroughly.
It would be helpful to provide logging: How To: Gather console, patch deployment and agent logs for Ivanti Patch for Windows Servers