https://learn.microsoft.com/en-us/dotnet/api/system.servicemodel.description.serviceauthorizationbehavior.shouldserializeexternalauthorizationpolicies?view=netframework-4.8.1
ServiceAuthorizationBehavior.ShouldSerializeExternalAuthorizationPolicies Method...
Returns a value that indicates whether the ExternalAuthorizationPolicies property has changed from its default value and should be serialized.
method