When performing resource updating to run it immediately, it will become scheduled and will not run on the scheduled time.
Manually start the task will not start either.
Make sure the service account for Service Account for Migration Manager RUM Controller Service is part of the Delegates.
To do that:.
1. Go to Project | Delegates
2. Type in the Service Account user name and password and click OK
3. Restart the Migration Manager RUM Controller Service service.