Registration of consumer users with the same UPN

矢野 尭生 160 Reputation points

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?

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Microsoft Entra External ID
A modern identity solution for securing access to customer, citizen and partner-facing apps and services. It is the converged platform of Azure AD External Identities B2B and B2C. Replaces Azure Active Directory External Identities.
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  1. Akhilesh 1,370 Reputation points Microsoft Vendor

    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.



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