Privilege to allow user to use REST subinventories

Summary:

My user has the standard roles in SCM like Inventory Manager. I have access to use REST subinventories. We have business users that we will restrict with custom roles. But can't find the privilege to make it work for the custom role. Looking for the privilege that will give that access.

Content (please ensure you mask any confidential information):

The custom role allows user to go into Inventory Management and access the Configure Subinventories. But in Postman, when running the GET against the subinventories REST, no records returned. No errors, but no data.

My user on the other hand with seeded roles also has system access to Configure Subinventories. And in Postman, gets output when running the same GET against the subinventories REST.