async def post(self,body: AuthenticationContextClassReference, request_configuration: Optional[RequestConfiguration[QueryParameters]] = None) -> Optional[AuthenticationContextClassReference]:
        """
        Create new navigation property to authenticationContextClassReferences for identity
        param body: The request body
        param request_configuration: Configuration for the request such as headers, query parameters, and middleware options.
        Returns: Optional[AuthenticationContextClassReference]
        """
        if body is None:
            raise TypeError("body cannot be null.")
        request_info = self.to_post_request_information(
            body, request_configuration
        )
        from ....models.o_data_errors.o_data_error import ODataError

        error_mapping: dict[str, type[ParsableFactory]] = {
            "XXX": ODataError,
        }
        if not self.request_adapter:
            raise Exception("Http core is null") 
        from ....models.authentication_context_class_reference import AuthenticationContextClassReference

        return await self.request_adapter.send_async(request_info, AuthenticationContextClassReference, error_mapping)

        Create new navigation property to authenticationContextClassReferences for identity
        param body: The request body
        param request_configuration: Configuration for the request such as headers, query parameters, and middleware options.
        Returns: Optional[AuthenticationContextClassReference]
        
msgraph/generated/identity/conditional_access/authentication_context_class_references/authentication_context_class_references_request_builder.py