Sorry to necro this thread.
But I also got the same problem.
I followed this guide https://www.manageengine.com/products/passwordmanagerpro/help/windows_service_account_reset.html
PMP can find the services and scheduled tasks related to the domain
service account. But if i want to reset the password, only the service
password is changed. The scheduled task is not changing. It still has
the old one