A new process, Affiliations, is introduced in the new Organization Account structure to build organization-level links between customers and MSPs. You can find the list of customers and resellers invited or added to the Organization Account under My Workspace | User Groups > Affiliations tab. The Super Admin of the respective account can review the pending Affiliations and approve or reject the request.
Adding customers or resellers is a 2-way process. Suppose an MSP initiates the process of sharing the products with a customer, the Super Admin of the customer Organization Account should review and approve the request to get added to the MSP Organization Account. Similarly, if a customer initiates the process of sharing the products with an MSP Organization Account, the Super Admin of the MSP Organization Account should review and approve the request.