When a Scrum Product Team includes more than 2 Scrum Teams we have found that it’s more than one Product Owner can handle. In this case, we suggest adding a Release Product Owner as a Product Owner Team lead. The PO team covers all the responsibilities and activities of a Product Owner divided into RPO and team PO roles.
Release Product Owner leads the PO team and is first and foremost responsible that the PO team presents a Single Voice
A clear statement of vision, direction, release purpose and goals
Managing overall Product Backlog and publishing the Product Backlog
Show alignment w/ product roadmap
Getting stakeholder buy-in on Product Backlog
Prioritization of Product Backlog
Prepare appropriate Product Backlog to drive release planning
Ongoing release plan forecasting
Deployment & release readiness checklist
Market launch split out to PM
Team Product Owner (or just PO) is a member of the Scrum Team responsible for working with the team from sprint to sprint and grooming the breakdown of Features into sprint sized User Stories so that they are prepared for Sprint Planning
Prioritize user stories to drive Sprint Planning
Acceptance criteria of stories in the sprint
Day to day available to the team for conversations about stories in the sprint
Accepting stories in the sprint