diff --git a/tests/ZB.MOM.WW.ScadaBridge.CentralUI.PlaywrightTests/Deployment/InstanceConfigureTests.cs b/tests/ZB.MOM.WW.ScadaBridge.CentralUI.PlaywrightTests/Deployment/InstanceConfigureTests.cs
index 8dd8faea..92ee8ad7 100644
--- a/tests/ZB.MOM.WW.ScadaBridge.CentralUI.PlaywrightTests/Deployment/InstanceConfigureTests.cs
+++ b/tests/ZB.MOM.WW.ScadaBridge.CentralUI.PlaywrightTests/Deployment/InstanceConfigureTests.cs
@@ -166,5 +166,82 @@ public sealed class InstanceConfigureTests : IClassFixture<InstanceConfigureFixt
         await Assertions.Expect(errorAlert).ToContainTextAsync("not found");
     }
 
-    // TODO(wave-N): alarm-override UI coverage — needs a template-with-alarm fixture (template alarms are not CLI-provisionable today).
+    /// <summary>
+    /// Alarm-override round-trip on the InstanceConfigure page's <b>Alarm Overrides</b> card: Edit the
+    /// fixture's non-locked HiLo alarm (<c>_cfg.AlarmName</c> = "HiHi"), set a priority override, Save →
+    /// one toast + an "overridden" badge, then verify the <c>InstanceAlarmOverride</c> actually persisted
+    /// via a CLI <c>instance get</c> read-back (not just the toast/badge), then Clear → badge gone +
+    /// override removed (re-verified via read-back).
+    ///
+    /// <para>
+    /// Read-back path: the <c>instance get</c> document surfaces an <c>alarmOverrides</c> array whose
+    /// elements are <c>{ id, instanceId, alarmCanonicalName, priorityLevelOverride }</c> (camelCase,
+    /// empirically verified against the dev cluster — same instance-document path the
+    /// <see cref="SaveOverride_RoundTrips"/> test uses for <c>attributeOverrides</c>). For a direct
+    /// (non-composed) alarm, <c>alarmCanonicalName</c> equals the alarm name.
+    /// </para>
+    ///
+    /// <para>
+    /// Setting only the PRIORITY field is the reliable "create override" delta — a Save with no
+    /// config-diff AND empty priority deletes the override instead. The fixture instance is SHARED, so
+    /// the test clears its own override in-body (badge gone + read-back empty) and again in a
+    /// <c>finally</c>, leaving the instance override-free as found.
+    /// </para>
+    /// </summary>
+    [SkippableFact]
+    public async Task AlarmOverride_SetPriority_ThenClear_RoundTrips()
+    {
+        Skip.IfNot(_cfg.Available, ClusterAvailability.SkipReason);
+
+        var page = await _fixture.NewAuthenticatedPageAsync("multi-role", "password");
+        try
+        {
+            await page.GotoAsync($"{PlaywrightFixture.BaseUrl}/deployment/instances/{_cfg.InstanceId}/configure");
+            await page.WaitForLoadStateAsync(LoadState.NetworkIdle);
+
+            // The Alarm Overrides card renders one row per non-locked template alarm; web-first wait
+            // for the fixture alarm's row so we never race the post-load re-render. No override yet.
+            var row = page.Locator($"[data-test='alarm-override-row-{_cfg.AlarmName}']");
+            await Assertions.Expect(row).ToBeVisibleAsync(new() { Timeout = 15_000 });
+            await Assertions.Expect(row.Locator("[data-test='alarm-override-badge']")).ToHaveCountAsync(0);
+
+            // Edit → set a priority override → Save. FillAsync fires the input event, so the priority
+            // input's @bind:event="oninput" commits before the Save click (no extra change dispatch).
+            await row.Locator("[data-test='alarm-edit-btn']").ClickAsync();
+            var priorityInput = page.Locator("[data-test='alarm-priority-input']");
+            await Assertions.Expect(priorityInput).ToBeVisibleAsync(new() { Timeout = 15_000 });
+            await priorityInput.FillAsync("750");
+            await page.Locator("[data-test='alarm-save-override']").ClickAsync();
+
+            await Assertions.Expect(page.Locator(".toast")).ToHaveCountAsync(1, new() { Timeout = 15_000 });
+            await Assertions.Expect(row.Locator("[data-test='alarm-override-badge']"))
+                .ToBeVisibleAsync(new() { Timeout = 15_000 });
+
+            // Verify the InstanceAlarmOverride persisted via CLI read-back (not just the toast/badge).
+            using (var doc = await CliRunner.GetInstanceDocumentAsync(_cfg.InstanceId))
+            {
+                var overrides = doc.RootElement.GetProperty("alarmOverrides");
+                Assert.Contains(overrides.EnumerateArray(), o =>
+                    o.GetProperty("alarmCanonicalName").GetString() == _cfg.AlarmName
+                    && o.GetProperty("priorityLevelOverride").GetInt32() == 750);
+            }
+
+            // Clear is immediate (no confirm): the badge disappears and the override is removed.
+            await row.Locator("[data-test='alarm-clear-btn']").ClickAsync();
+            await Assertions.Expect(row.Locator("[data-test='alarm-override-badge']"))
+                .ToHaveCountAsync(0, new() { Timeout = 15_000 });
+            using (var doc = await CliRunner.GetInstanceDocumentAsync(_cfg.InstanceId))
+            {
+                var overrides = doc.RootElement.GetProperty("alarmOverrides");
+                Assert.DoesNotContain(overrides.EnumerateArray(), o =>
+                    o.GetProperty("alarmCanonicalName").GetString() == _cfg.AlarmName);
+            }
+        }
+        finally
+        {
+            // Belt-and-braces: leave the shared fixture instance override-free even if an assertion
+            // above threw after the Save (best-effort; never masks the test's own failure).
+            await CliRunner.DeleteInstanceAlarmOverrideAsync(_cfg.InstanceId, _cfg.AlarmName);
+        }
+    }
 }