The AEMP configuration group is automatically created when you make the AEMP mobile device type available in the library.
You will note however that you cannot edit an AEMP default configuration group, nor can you add any assets to this group. The group will not be available for selection when you create an asset in Fleet admin either. The reason for this is that you cannot manually add an asset from the AEMP provider list and that these assets can only be added to MiX Fleet Manager via the AEMP asset onboarding page.