When you create an Intune tenant within your environment, you execute the creation with an account which is Global Administrator within Azure Active Directory. And in my work as an indendent consultant I see a lot of companies which keep using the account with Global Administator rights to manage their Microsoft Intune environment as well.
While for initially setting up some Azure AD functionality Global Administrator rights might be needed, this is only the case during the setup phase. Once you have implemented your environment, you hardly ever need the Global Administrator rights and for most tasks they are not needed perse. Think of the Global Administrator rights as an equivalalent of the Forest Administrator/Schema Administrator group within Active Directory.
Disclaimer: This post is written on December 4th 2019 and reflects the state of this functionality at that point in time.Read More