def by_access_review_instance_id(self,access_review_instance_id: str) -> AccessReviewInstanceItemRequestBuilder:
        """
        Provides operations to manage the instances property of the microsoft.graph.accessReviewScheduleDefinition entity.
        param access_review_instance_id: The unique identifier of accessReviewInstance
        Returns: AccessReviewInstanceItemRequestBuilder
        """
        if access_review_instance_id is None:
            raise TypeError("access_review_instance_id cannot be null.")
        from .item.access_review_instance_item_request_builder import AccessReviewInstanceItemRequestBuilder

        url_tpl_params = get_path_parameters(self.path_parameters)
        url_tpl_params["accessReviewInstance%2Did"] = access_review_instance_id
        return AccessReviewInstanceItemRequestBuilder(self.request_adapter, url_tpl_params)

        Provides operations to manage the instances property of the microsoft.graph.accessReviewScheduleDefinition entity.
        param access_review_instance_id: The unique identifier of accessReviewInstance
        Returns: AccessReviewInstanceItemRequestBuilder
        
msgraph/generated/identity_governance/access_reviews/definitions/item/instances/instances_request_builder.py