Also check people_managers feature gate

app/controllers/event/participation_contact_data/managed_controller.rb

@@ -48,6 +48,7 @@ def privacy_policy_param
   end
 
   def assert_feature_enabled
-    FeatureGate.assert!('people.people_managers.self_service_managed_creation')
+    FeatureGate.assert!('people.people_managers') &&
+      FeatureGate.assert!('people.people_managers.self_service_managed_creation')
   end
 end

spec/controllers/event/participation_contact_data/managed_controller_spec.rb

@@ -0,0 +1,52 @@
+# frozen_string_literal: true
+
+#  Copyright (c) 2023, Schweizer Alpen-Club. This file is part of
+#  hitobito_youth and licensed under the Affero General Public License version 3
+#  or later. See the COPYING file at the top-level directory or at
+#  https://github.com/hitobito/hitobito_youth
+
+require 'spec_helper'
+
+describe Event::ParticipationContactData::ManagedController do
+
+  let(:params) { { group_id: groups(:top_layer), event_id: events(:top_event) } }
+
+  def request(method, action)
+    send(method, action, params: params)
+  end
+
+  { get: :edit, post: :update }.each do |method, action|
+    context 'with people_manager feature enabled' do
+      before do
+        allow(FeatureGate).to receive(:enabled?).
+          with('people.people_managers').
+          and_return(true)
+      end
+
+      it "with self_service_managed_creation enabled does not raise FeatureGate error" do
+        expect { request(method, action) }.not_to raise_error
+      end
+
+      it "with self_service_managed_creation disabled raises FeatureGate error" do
+        expect { request(method, action) }.to raise_error(FeatureGate::FeatureDisabled)
+      end
+    end
+
+    context 'with people_manager feature disabled' do
+      before do
+        allow(FeatureGate).to receive(:enabled?).
+          with('people.people_managers').
+          and_return(false)
+      end
+
+      it "with self_service_managed_creation enabled raises FeatureGate error" do
+        expect { request(method, action) }.to raise_error(FeatureGate::FeatureDisabled)
+      end
+
+      it "with self_service_managed_creation disabled raises FeatureGate error" do
+        expect { request(method, action) }.to raise_error(FeatureGate::FeatureDisabled)
+      end
+    end
+  end
+
+end