MSP can register all its devices and licenses in MSP inventory & license, so MSP can assign any device to the Org/Network, and associate the license to the devices without the need to access each organization to do the action mentioned above.
This is where you add the Organizations with full PRO plans to activate the MSP functions.
This is the first step to active MSP license functions, if not, many MSP functions will not be fully supported.
Since most of configurations in MSP portal are management authority related. To provide better tracking records for MSP admins, all operations in MSP portal will be logged.