Let's look at The Scrum Guide, especially the expectations for the role of Product Owner.
The Product Owner is responsible for maximizing the value of the product resulting from work of the Development Team. How this is done may vary widely across organizations, Scrum Teams, and individuals.
Working with a Product Owner who does not have domain or market knowledge and experience is key. Who is responsible for assisting the Product Owner? For one, the Scrum Master.
The Scrum Master serves the Product Owner in several ways, including:
- Ensuring the Product Owner knows how to arrange the Product Backlog to maximize value
This does not, and should not, exclude the Development Team and others from assisting. However, the effort cannot grind to a halt. The value of Focus should be kept in mind: the Development Team should continue to provide valuable increments.
Just as when any other Scrum Team member is added, work together to integrate them.