Hi @Meryem Chemmaoui
Thank you for reaching out to Microsoft Q&A.
I understand that when you try to create an Azure student account using your edu email, it is being rejected due to an identity provider. Additionally, when attempting to access the Azure portal, you are encountering an "interaction required" issue with the error code AADSTS16000.
Whenever you sign in Azure portal using Microsoft Account (Outlook, Hotmail...) by default get connected to the Microsoft Services tenant ('f9885e6e-6f74-46b3-b595- 350157a27541).
As this is a standard tenant without any directory associated you cannot perform any actions. To perform any actions, you must have administrative access to the tenant.
Solution: For this purpose, you need to create your own tenant rather than using the Microsoft Services ('f9885e6e-6f74-46b3-b595- 350157a27541) tenant.
To create a new tenant, open in-private/incognito browser window (just to avoid SSO), access https://azure.microsoft.com/en-us/free/ to create a free Azure account.
When you create a new tenant, you by default become the Global Administrator of the new tenant and have full access to all the options in that tenant.
If you still want to access Entra portal using your edu Microsoft account only, you can invite that user as a guest user as mentioned here: https://learn.microsoft.com/en-us/azure/active-directory/external-identities/add-users-administrator#add-guest-users-to-the-directory and assign the Global Administrator role to proceed further with the account.
Once you are added to an azure tenant and you accept the invite sent to you via email, you can use https://portal.azure.com/#create/Microsoft.AzureActiveDirectory URL to create your own tenant as well.
Hope this helps. Do let us know if you any further queries.
Best Regards,
Harshitha Eligeti.