How to Determine Owners for Onboarding Journey Tasks?

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Requirement: I want a group of specific Journeys Administrators to access and manage all employees' Journeys. This is determined by the set of roles that will be assigned - not AOR. Which option should I choose under 'Owner' for the tasks? Are there any prerequisites other than ensuring those users have the "Manage Journey by HR" role?

Side Question: Does the "Manage Journey by HR" role provide users access to any Journeys, even if they have not initiated the transaction themselves?

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