PropertyProxyValidator && SelfValidation

I have a DTO class that implements self-validation. Can the PropertyProxyValidator call this self-validation?

For example:

public class Volunteer
{
        [StringLengthValidator(1, 50, MessageTemplate = "Last Name is between 1 and 50 characters")]
        [NotNullValidator(MessageTemplate = "Last Name is required")]
        public string LastName { get; set; }
}

Works with PropertyProxyValidator

But

        [HasSelfValidation]
        public class Volunteer(
        public string LastName { get; set; }
        public void ValidateFirstName(ValidationResults results)
        {
            if (LastName != null && LastName.Length > 50)
            {
                results.AddResult(new ValidationResult("LastName is between 1 and 50 characters",
                    this, string.Empty, string.Empty, null));
            }
        }
        }

Does not work