diff --git a/frontend/src/views/admin/GroupsView.vue b/frontend/src/views/admin/GroupsView.vue
index d019a24b8ef1..612624904d7b 100644
--- a/frontend/src/views/admin/GroupsView.vue
+++ b/frontend/src/views/admin/GroupsView.vue
@@ -6087,7 +6087,7 @@ const handleCreateGroup = async () => {
     }
   } catch (error: any) {
     appStore.showError(
-      error.response?.data?.detail || t("admin.groups.failedToCreate"),
+      extractApiErrorMessage(error, t("admin.groups.failedToCreate")),
     );
     console.error("Error creating group:", error);
     // Don't advance tour on error
@@ -6358,7 +6358,7 @@ const handleUpdateGroup = async () => {
     loadGroups();
   } catch (error: any) {
     appStore.showError(
-      error.response?.data?.detail || t("admin.groups.failedToUpdate"),
+      extractApiErrorMessage(error, t("admin.groups.failedToUpdate")),
     );
     console.error("Error updating group:", error);
   } finally {
diff --git a/frontend/src/views/admin/__tests__/GroupsView.duplicate.spec.ts b/frontend/src/views/admin/__tests__/GroupsView.duplicate.spec.ts
index 151737e04921..10690d87e338 100644
--- a/frontend/src/views/admin/__tests__/GroupsView.duplicate.spec.ts
+++ b/frontend/src/views/admin/__tests__/GroupsView.duplicate.spec.ts
@@ -8,6 +8,7 @@ import GroupsView from '@/views/admin/GroupsView.vue'
 const {
   listGroups,
   duplicateGroup,
+  updateGroup,
   getModelsListCandidates,
   getUsageSummary,
   getCapacitySummary,
@@ -17,6 +18,7 @@ const {
 } = vi.hoisted(() => ({
   listGroups: vi.fn(),
   duplicateGroup: vi.fn(),
+  updateGroup: vi.fn(),
   getModelsListCandidates: vi.fn(),
   getUsageSummary: vi.fn(),
   getCapacitySummary: vi.fn(),
@@ -36,7 +38,7 @@ vi.mock('@/api/admin', () => ({
       getLiveCapability,
       getAll: vi.fn(),
       create: vi.fn(),
-      update: vi.fn(),
+      update: updateGroup,
       delete: vi.fn(),
       updateSortOrder: vi.fn()
     },
@@ -136,6 +138,13 @@ const DataTableStub = defineComponent({
   template: '<div><div v-for="row in data" :key="row.id"><slot name="cell-actions" :row="row" /></div></div>'
 })
 
+const BaseDialogStub = defineComponent({
+  props: {
+    show: { type: Boolean, default: false }
+  },
+  template: '<div v-if="show"><slot /><slot name="footer" /></div>'
+})
+
 function mountView() {
   return mount(GroupsView, {
     global: {
@@ -144,7 +153,7 @@ function mountView() {
         TablePageLayout: TablePageLayoutStub,
         DataTable: DataTableStub,
         Pagination: true,
-        BaseDialog: true,
+        BaseDialog: BaseDialogStub,
         ConfirmDialog: true,
         EmptyState: true,
         Select: true,
@@ -166,6 +175,7 @@ describe('GroupsView duplicate action', () => {
     for (const fn of [
       listGroups,
       duplicateGroup,
+      updateGroup,
       getModelsListCandidates,
       getUsageSummary,
       getCapacitySummary,
@@ -270,4 +280,26 @@ describe('GroupsView duplicate action', () => {
     expect(showError).not.toHaveBeenCalledWith('admin.groups.duplicateFailed')
     wrapper.unmount()
   })
+
+  it('shows the standardized API message when updating a group fails', async () => {
+    updateGroup.mockRejectedValueOnce({
+      status: 409,
+      code: 409,
+      message: 'group name already exists',
+      reason: 'GROUP_EXISTS'
+    })
+    const wrapper = mountView()
+    await flushPromises()
+
+    const editButton = wrapper.findAll('button').find((button) => button.text() === 'common.edit')
+    expect(editButton).toBeTruthy()
+    await editButton!.trigger('click')
+    await flushPromises()
+    await wrapper.get('#edit-group-form').trigger('submit')
+    await flushPromises()
+
+    expect(updateGroup).toHaveBeenCalledTimes(1)
+    expect(showError).toHaveBeenCalledWith('group name already exists')
+    wrapper.unmount()
+  })
 })