In Microsoft Entra ID, the Owner role for a registered application can be assigned to users [User1] and service principals [SP1]. Groups cannot be assigned as owners of enterprise applications. A user is automatically added as an owner when they register an application, unless they have administrator roles. Service principals, which represent applications, hosted services, or automated tools, can also be owners. Reference: https://learn.microsoft.com/en-us/entra/identity/role-based-access-control/permissions-reference