Registration of consumer users with the same UPN

Question

Is the UPN of a consumer user registered with Azure AD B2C unique for each tenant?

Can I register consumer users with the same UPN in multiple Azure AD B2C tenants?

Answer 1

Hi @矢野 尭生

Thank you for reaching us!

For your query, the User Principal Name (UPN) is a unique identifier for a user in Azure AD B2C. Each user in Azure AD B2C must have a unique UPN within the same tenant. However, the same UPN can be used to register consumer users across multiple Azure AD B2C tenants. since the uniqueness constraint applies only within a single tenant.
I hope this answer helps! If you have any further questions, please feel free to ask.

Reference: https://learn.microsoft.com/en-us/azure/active-directory-b2c/user-profile-attributes

https://learn.microsoft.com/en-us/azure/active-directory-b2c/manage-users-portal

https://learn.microsoft.com/en-us/azure/active-directory-b2c/user-overview

Thanks,
Akhilesh.

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