Box 1: Yes -
User1 is a Cloud Device Administrator.
Device2 is Azure AD joined.
Group1 has the assigned to join type. User1 is the owner of Group1.
Note: Assigned groups - Manually add users or devices into a static group.
Azure AD joined or hybrid Azure AD joined devices utilize an organizational account in Azure AD
Box 2: No -
User2 is a User Administrator.
Device1 is Azure AD registered.
Group1 has the assigned join type, and the owner is User1.
Note: Azure AD registered devices utilize an account managed by the end user, this account is either a Microsoft account or another locally managed credential.
Box 3: Yes -
User2 is a User Administrator.
Device2 is Azure AD joined.
Group2 has the Dynamic Device join type, and the owner is User2.
Reference:
https://docs.microsoft.com/en-us/azure/active-directory/devices/overview
