In order to be able to access the relevant data for the Inventory Check Assessment Task, applicable Salesforce Users should have the View All permission for Product Category Products. 

The below instructions describe how to set the required permission via a Salesforce Profile. Other mechanisms can also be used to set the required permission, e.g. Permission Sets.

Navigate to Setup on the Salesforce Platform

A Salesforce Administrator should navigate to Setup > Users > Profiles > Profile > Object Settings > Product Category Products and ensure that the View All checkbox has been enabled.