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ServiceNow.Core 
SNow.Core.Authentication.AuthenticationConfig 
AuthenticationConfig.TenantId Property 
The Tenant is:
- either the tenant ID of the Azure AD tenant in which this application is registered (a guid) or a domain name associated with the tenant
 - or 'organizations' (for a multi-tenant application)
 
csharp
public string TenantId { get; set; }