You have an Azure subscription named Sub1. Sub1 contains two resource groups named RG1 and RG2.
You need to ensure that Global Administrators can manage all resources contained in RG1 and RG2.
Solution: From the Azure Active Directory Roles and administrators blade, you modify the Global administrator role properties.
Does this solution meet the goal?
This solution does not meet the goal. To ensure that Global Administrators maintain full access to Azure resources, you need to enable the Access management for Azure resources property from the Azure AD tenant's Properties blade.
The only properties of the Global Administrators (or any Azure AD) group that can be modified are the name, description, and membership type field. None of these properties accomplishes the scenario requirement.