问题
Do you know the unique user id in multi tenant Azure AD apps pattern?
I'm now developing app using Microsoft Graph with Azure AD multi-tenant application pattern. For identifying each user I want to know the unique id - I'll use it as a key in our own database to save user's data.
In this reference, id parameter in user object is "The unique identifier for the user", but I wonder is it unique id in each tenant or in all tenant? It is important thing because my app will use in multi tenant.
FYI: If user id is unique only in each tenant, I'll concatenate organization id and user id for making unique id in all tenant.
回答1:
The id property is a random GUID. While it would be unlikely to have two users with identical IDs, unless there is a check in Azure, it could happen.
I would concatenate it with the tenant ID, or even better have the tenant ID in another column in the DB. That way you can query users on a per-tenant basis in your DB.
来源：https://stackoverflow.com/questions/42747115/unique-user-id-in-multi-tenant-azure-ad-apps