All Device operations require necessary permissions. Refer User Profiles document for more details..
Note: Once you click Add, the device product will be added to the Product Gallery (Device), even if you don't complete the rest of the setup process for adding the device.
Note: It is mandatory to add the datapoint definitions at this stage for your product, as you won't be able to add them once the product is associated with a model. However, you can still add datapoint templates to the associated device model later, which will then become part of the device instance.