async def patch(self,body: AccessReviewInstance, request_configuration: Optional[RequestConfiguration[QueryParameters]] = None) -> Optional[AccessReviewInstance]:
        """
        Update the properties of an accessReviewInstance object. Only the reviewers and fallbackReviewers properties can be updated but the scope property is also required in the request body. You can only add reviewers to the fallbackReviewers property but can't remove existing fallbackReviewers. To update an accessReviewInstance, it's status must be InProgress.
        param body: The request body
        param request_configuration: Configuration for the request such as headers, query parameters, and middleware options.
        Returns: Optional[AccessReviewInstance]
        Find more info here: https://learn.microsoft.com/graph/api/accessreviewinstance-update?view=graph-rest-1.0
        """
        if body is None:
            raise TypeError("body cannot be null.")
        request_info = self.to_patch_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.access_review_instance import AccessReviewInstance

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

        Update the properties of an accessReviewInstance object. Only the reviewers and fallbackReviewers properties can be updated but the scope property is also required in the request body. You can only add reviewers to the fallbackReviewers property but can't remove existing fallbackReviewers. To update an accessReviewInstance, it's status must be InProgress.
        param body: The request body
        param request_configuration: Configuration for the request such as headers, query parameters, and middleware options.
        Returns: Optional[AccessReviewInstance]
        Find more info here: https://learn.microsoft.com/graph/api/accessreviewinstance-update?view=graph-rest-1.0
        
msgraph/generated/identity_governance/access_reviews/definitions/item/instances/item/access_review_instance_item_request_builder.py