When upgrading in a server, if different users have scheduled tasks, the migration using a domain user instead of a local server administrator user shows errors. But the issue when you try to upgrade using the Administrator local user is when you try to migrate the tasks is going to ask for all the users and passwords of all the users that have scheduled tasks.
Is good to have the ability for every user to migrate their own scheduled tasks.
This is an example of upgrading using an end domain user with admin rights:
This is an example using the local server administrator user: