def by_feature_rollout_policy_id(self,feature_rollout_policy_id: str) -> FeatureRolloutPolicyItemRequestBuilder:
        """
        Provides operations to manage the featureRolloutPolicies property of the microsoft.graph.policyRoot entity.
        param feature_rollout_policy_id: The unique identifier of featureRolloutPolicy
        Returns: FeatureRolloutPolicyItemRequestBuilder
        """
        if feature_rollout_policy_id is None:
            raise TypeError("feature_rollout_policy_id cannot be null.")
        from .item.feature_rollout_policy_item_request_builder import FeatureRolloutPolicyItemRequestBuilder

        url_tpl_params = get_path_parameters(self.path_parameters)
        url_tpl_params["featureRolloutPolicy%2Did"] = feature_rollout_policy_id
        return FeatureRolloutPolicyItemRequestBuilder(self.request_adapter, url_tpl_params)

        Provides operations to manage the featureRolloutPolicies property of the microsoft.graph.policyRoot entity.
        param feature_rollout_policy_id: The unique identifier of featureRolloutPolicy
        Returns: FeatureRolloutPolicyItemRequestBuilder
        
msgraph/generated/policies/feature_rollout_policies/feature_rollout_policies_request_builder.py