Hi @Lova RABARISON ,
Thanks for reaching out.
As @Givary-MSFT mentioned that you are getting this error as you are connected with Micrsoft Service Account.
Whenever you sign in Azure portal using Microsoft Personal Account you by default get connected to the Microsoft Services tenant (f8cdef31-a31e-4b4a-93e4-5f571e91255a).
You can also confirm this by navigating to Azure Active Directory > Overview blade and you can see f8cdef31-a31e-4b4a-93e4-5f571e91255a as Tenant ID.
In this default tenant, you do not have any directory associated with it which you can check by navigating to settings.
As this is a standard tenant without any directory associated, it won't allow you to perform any administrative action.
For this purpose, you need to create a new tenant using https://azure.microsoft.com/en-us/free/ to create a free Azure account.
which allows you to create your work or school account by filling in all your details.
Once you are able to create that account, you by default become Global administrator of your tenant which is different from Microsoft Services tenant (f8cdef31-a31e-4b4a-93e4-5f571e91255a).
There you can add your gmail account as guest user and give admin rights to access any resources using that account.
As this might confuse you between two accounts, so let me clarify the difference between personal account and work account here.
A work or school account is created by an organization using a business service that has Azure Active Directory/Microsoft Entra as the authentication and authorization platform. A work account typically uses an organization’s custom domain name or company name ie.(UserName@yourorg.com). These are created by an organization’s administrator to enable a member of the organization access to Microsoft cloud services such as Microsoft Azure, Microsoft Intune or Microsoft 365.
A Microsoft account (MSA) is an account created by a user for personal use which is used to sign into all consumer-oriented Microsoft products and cloud services such as Outlook (Hotmail), Messenger, OneDrive, MSN or Xbox LIVE. Your Microsoft account is created and stored in the Microsoft consumer identity account system that is run by Microsoft.
Hope this will help you.
If you have any other questions, please let us know to assist you further.
Thanks,
Shweta