NSubstitute with object as parameter in Received call

I am using NSubstitute for my Unit tests. I need to check that a object is send to a void method inside the method I am testing. I only need to check that the object is sent with one of the properties being a certain value. eg. ``` ///The object in question public class Person { public string Name { get; set; } public string Surname{get;set;} } ``` Two simple methods ``` public void NameStartsWithA(Person person) { //do something to person when name starts with A } public void NameStartsWithB(Person person) { //do something to person when name starts with B } ``` The method i am writing the test for. ``` public void MethodBeingTested() { var person = new Person() {Name = "Adrian",Surname="SomeSurname"}; if(person.Name.StartsWith("A")) NameStartsWithA(person); else NameStartsWithB(person); } ``` If the person name starts with an A, I need to check, using NSubstitute that the "NameStartsWithA" was called with a name that starts with an A. My Unit Test so far looks something like this ``` _someService.Received().NameStartsWithA(new Person(){Name="Adrian",Surname=Arg.Any<string>()}); ``` But Nsubstitute says the function was never called, but when I do the same test with "RecievedArgumentsAny()" then it passes. Hope this example helps you in understanding what I am trying to accomplish.