diff --git a/x-pack/test/functional_with_es_ssl/apps/triggers_actions_ui/details.ts b/x-pack/test/functional_with_es_ssl/apps/triggers_actions_ui/details.ts
index 1d86d95b7a796..fdcb456493dab 100644
--- a/x-pack/test/functional_with_es_ssl/apps/triggers_actions_ui/details.ts
+++ b/x-pack/test/functional_with_es_ssl/apps/triggers_actions_ui/details.ts
@@ -9,6 +9,7 @@ import uuid from 'uuid';
 import { omit, mapValues, range, flatten } from 'lodash';
 import moment from 'moment';
 import { FtrProviderContext } from '../../ftr_provider_context';
+import { alwaysFiringAlertType } from '../../fixtures/plugins/alerts/server/plugin';
 
 export default ({ getPageObjects, getService }: FtrProviderContext) => {
   const testSubjects = getService('testSubjects');
@@ -306,8 +307,7 @@ export default ({ getPageObjects, getService }: FtrProviderContext) => {
       });
     });
 
-    // FLAKY: https://github.com/elastic/kibana/issues/57426
-    describe.skip('Alert Instances', function () {
+    describe('Alert Instances', function () {
       const testRunUuid = uuid.v4();
       let alert: any;
 
@@ -373,16 +373,31 @@ export default ({ getPageObjects, getService }: FtrProviderContext) => {
         // refresh to ensure Api call and UI are looking at freshest output
         await browser.refresh();
 
+        // Get action groups
+        const { actionGroups } = alwaysFiringAlertType;
+
         // Verify content
         await testSubjects.existOrFail('alertInstancesList');
 
-        const summary = await alerting.alerts.getAlertInstanceSummary(alert.id);
+        const actionGroupNameFromId = (actionGroupId: string) =>
+          actionGroups.find(
+            (actionGroup: { id: string; name: string }) => actionGroup.id === actionGroupId
+          )?.name;
 
+        const summary = await alerting.alerts.getAlertInstanceSummary(alert.id);
         const dateOnAllInstancesFromApiResponse = mapValues(
           summary.instances,
           (instance) => instance.activeStartDate
         );
 
+        const actionGroupNameOnAllInstancesFromApiResponse = mapValues(
+          summary.instances,
+          (instance) => {
+            const name = actionGroupNameFromId(instance.actionGroupId);
+            return name ? ` (${name})` : '';
+          }
+        );
+
         log.debug(
           `API RESULT: ${Object.entries(dateOnAllInstancesFromApiResponse)
             .map(([id, date]) => `${id}: ${moment(date).utc()}`)
@@ -393,21 +408,21 @@ export default ({ getPageObjects, getService }: FtrProviderContext) => {
         expect(instancesList.map((instance) => omit(instance, 'duration'))).to.eql([
           {
             instance: 'us-central',
-            status: 'Active (Default)',
+            status: `Active${actionGroupNameOnAllInstancesFromApiResponse['us-central']}`,
             start: moment(dateOnAllInstancesFromApiResponse['us-central'])
               .utc()
               .format('D MMM YYYY @ HH:mm:ss'),
           },
           {
             instance: 'us-east',
-            status: 'Active (Default)',
+            status: `Active${actionGroupNameOnAllInstancesFromApiResponse['us-east']}`,
             start: moment(dateOnAllInstancesFromApiResponse['us-east'])
               .utc()
               .format('D MMM YYYY @ HH:mm:ss'),
           },
           {
             instance: 'us-west',
-            status: 'Active (Default)',
+            status: `Active${actionGroupNameOnAllInstancesFromApiResponse['us-west']}`,
             start: moment(dateOnAllInstancesFromApiResponse['us-west'])
               .utc()
               .format('D MMM YYYY @ HH:mm:ss'),
diff --git a/x-pack/test/functional_with_es_ssl/fixtures/plugins/alerts/server/plugin.ts b/x-pack/test/functional_with_es_ssl/fixtures/plugins/alerts/server/plugin.ts
index 6f9d010378624..6584c5891a8b9 100644
--- a/x-pack/test/functional_with_es_ssl/fixtures/plugins/alerts/server/plugin.ts
+++ b/x-pack/test/functional_with_es_ssl/fixtures/plugins/alerts/server/plugin.ts
@@ -17,11 +17,62 @@ export interface AlertingExampleDeps {
   features: FeaturesPluginSetup;
 }
 
+export const noopAlertType: AlertType = {
+  id: 'test.noop',
+  name: 'Test: Noop',
+  actionGroups: [{ id: 'default', name: 'Default' }],
+  defaultActionGroupId: 'default',
+  async executor() {},
+  producer: 'alerts',
+};
+
+export const alwaysFiringAlertType: any = {
+  id: 'test.always-firing',
+  name: 'Always Firing',
+  actionGroups: [
+    { id: 'default', name: 'Default' },
+    { id: 'other', name: 'Other' },
+  ],
+  defaultActionGroupId: 'default',
+  producer: 'alerts',
+  async executor(alertExecutorOptions: any) {
+    const { services, state, params } = alertExecutorOptions;
+
+    (params.instances || []).forEach((instance: { id: string; state: any }) => {
+      services
+        .alertInstanceFactory(instance.id)
+        .replaceState({ instanceStateValue: true, ...(instance.state || {}) })
+        .scheduleActions('default');
+    });
+
+    return {
+      globalStateValue: true,
+      groupInSeriesIndex: (state.groupInSeriesIndex || 0) + 1,
+    };
+  },
+};
+
+export const failingAlertType: any = {
+  id: 'test.failing',
+  name: 'Test: Failing',
+  actionGroups: [
+    {
+      id: 'default',
+      name: 'Default',
+    },
+  ],
+  producer: 'alerts',
+  defaultActionGroupId: 'default',
+  async executor() {
+    throw new Error('Failed to execute alert type');
+  },
+};
+
 export class AlertingFixturePlugin implements Plugin<void, void, AlertingExampleDeps> {
   public setup(core: CoreSetup, { alerts, features }: AlertingExampleDeps) {
-    createNoopAlertType(alerts);
-    createAlwaysFiringAlertType(alerts);
-    createFailingAlertType(alerts);
+    alerts.registerType(noopAlertType);
+    alerts.registerType(alwaysFiringAlertType);
+    alerts.registerType(failingAlertType);
     features.registerKibanaFeature({
       id: 'alerting_fixture',
       name: 'alerting_fixture',
@@ -56,64 +107,3 @@ export class AlertingFixturePlugin implements Plugin<void, void, AlertingExample
   public start() {}
   public stop() {}
 }
-
-function createNoopAlertType(alerts: AlertingSetup) {
-  const noopAlertType: AlertType = {
-    id: 'test.noop',
-    name: 'Test: Noop',
-    actionGroups: [{ id: 'default', name: 'Default' }],
-    defaultActionGroupId: 'default',
-    async executor() {},
-    producer: 'alerts',
-  };
-  alerts.registerType(noopAlertType);
-}
-
-function createAlwaysFiringAlertType(alerts: AlertingSetup) {
-  // Alert types
-  const alwaysFiringAlertType: any = {
-    id: 'test.always-firing',
-    name: 'Always Firing',
-    actionGroups: [
-      { id: 'default', name: 'Default' },
-      { id: 'other', name: 'Other' },
-    ],
-    defaultActionGroupId: 'default',
-    producer: 'alerts',
-    async executor(alertExecutorOptions: any) {
-      const { services, state, params } = alertExecutorOptions;
-
-      (params.instances || []).forEach((instance: { id: string; state: any }) => {
-        services
-          .alertInstanceFactory(instance.id)
-          .replaceState({ instanceStateValue: true, ...(instance.state || {}) })
-          .scheduleActions('default');
-      });
-
-      return {
-        globalStateValue: true,
-        groupInSeriesIndex: (state.groupInSeriesIndex || 0) + 1,
-      };
-    },
-  };
-  alerts.registerType(alwaysFiringAlertType);
-}
-
-function createFailingAlertType(alerts: AlertingSetup) {
-  const failingAlertType: any = {
-    id: 'test.failing',
-    name: 'Test: Failing',
-    actionGroups: [
-      {
-        id: 'default',
-        name: 'Default',
-      },
-    ],
-    producer: 'alerts',
-    defaultActionGroupId: 'default',
-    async executor() {
-      throw new Error('Failed to execute alert type');
-    },
-  };
-  alerts.registerType(failingAlertType);
-}
diff --git a/x-pack/test/functional_with_es_ssl/services/alerting/alerts.ts b/x-pack/test/functional_with_es_ssl/services/alerting/alerts.ts
index 942b352b4afd3..5ab07aa00412b 100644
--- a/x-pack/test/functional_with_es_ssl/services/alerting/alerts.ts
+++ b/x-pack/test/functional_with_es_ssl/services/alerting/alerts.ts
@@ -20,6 +20,7 @@ export interface AlertInstanceSummary {
 export interface AlertInstanceStatus {
   status: string;
   muted: boolean;
+  actionGroupId: string;
   activeStartDate?: string;
 }