AuthenticationResult.UniqueId Property
Definition
Important
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Gets the Unique Id of the account in this TenantId
It is set as the oid (ObjectId) claim, or if that claim is null, as the sub (Subject) claim which is guaranteed not-null.
public string UniqueId { get; }member this.UniqueId : stringPublic ReadOnly Property UniqueId As StringProperty Value
Remarks
The oid claim identifies a user in all apps - Microsoft Identity Providers issue ID tokens with this claim, although it can be null in rare cases. The sub claim is "a locally unique and never reassigned identifier within the Issuer for the End-User" as per https://openid.net/specs/openid-connect-core-1_0.html and it is a mandatory claim with OIDC compliant issuers. Guest AAD accounts have different oid claim values in each tenant. Use Microsoft.Identity.Client.Account.HomeAccountId to uniquely identify users across tenants. See https://docs.microsoft.com/azure/active-directory/develop/id-tokens#payload-claims