diff --git a/app/src/androidTest/java/org/mozilla/fenix/helpers/HomeActivityTestRule.kt b/app/src/androidTest/java/org/mozilla/fenix/helpers/HomeActivityTestRule.kt
index eb1950b62..3a3a97453 100644
--- a/app/src/androidTest/java/org/mozilla/fenix/helpers/HomeActivityTestRule.kt
+++ b/app/src/androidTest/java/org/mozilla/fenix/helpers/HomeActivityTestRule.kt
@@ -175,7 +175,7 @@ class HomeActivityIntentTestRule internal constructor(
     }
 
     override fun getActivityIntent(): Intent {
-        return if(this::intent.isInitialized) {
+        return if (this::intent.isInitialized) {
             this.intent
         } else {
             super.getActivityIntent()
diff --git a/app/src/androidTest/java/org/mozilla/fenix/ui/NimbusEventTest.kt b/app/src/androidTest/java/org/mozilla/fenix/ui/NimbusEventTest.kt
index 195980a10..4b2b8bfee 100644
--- a/app/src/androidTest/java/org/mozilla/fenix/ui/NimbusEventTest.kt
+++ b/app/src/androidTest/java/org/mozilla/fenix/ui/NimbusEventTest.kt
@@ -3,14 +3,21 @@ package org.mozilla.fenix.ui
 import android.content.Intent
 import androidx.test.platform.app.InstrumentationRegistry
 import androidx.test.uiautomator.UiDevice
-import mozilla.components.concept.sync.*
+import io.mockk.mockk
+import mozilla.components.concept.sync.AuthType
 import okhttp3.mockwebserver.MockWebServer
-import org.junit.*
+import org.junit.After
+import org.junit.Assert.assertTrue
+import org.junit.Before
+import org.junit.Rule
+import org.junit.Test
 import org.mozilla.fenix.components.TelemetryAccountObserver
-import org.mozilla.fenix.helpers.*
+import org.mozilla.fenix.helpers.AndroidAssetDispatcher
+import org.mozilla.fenix.helpers.Experimentation
+import org.mozilla.fenix.helpers.HomeActivityIntentTestRule
+import org.mozilla.fenix.helpers.RetryTestRule
 import org.mozilla.fenix.helpers.TestHelper.appContext
 import org.mozilla.fenix.ui.robots.homeScreen
-import io.mockk.mockk
 
 class NimbusEventTest {
     private lateinit var mDevice: UiDevice
@@ -18,9 +25,11 @@ class NimbusEventTest {
 
     @get:Rule
     val homeActivityTestRule = HomeActivityIntentTestRule.withDefaultSettingsOverrides()
-        .withIntent(Intent().apply {
-            action = Intent.ACTION_VIEW
-        })
+        .withIntent(
+            Intent().apply {
+                action = Intent.ACTION_VIEW
+            },
+        )
 
     @Rule
     @JvmField
@@ -46,7 +55,7 @@ class NimbusEventTest {
         homeScreen { }.dismissOnboarding()
 
         Experimentation.withHelper {
-            Assert.assertTrue(evalJexl("'app_opened'|eventSum('Days', 28, 0) > 0"))
+            assertTrue(evalJexl("'app_opened'|eventSum('Days', 28, 0) > 0"))
         }
     }
 
@@ -56,7 +65,7 @@ class NimbusEventTest {
         observer.onAuthenticated(mockk(), AuthType.Signin)
 
         Experimentation.withHelper {
-            Assert.assertTrue(evalJexl("'sync_auth_sign_in'|eventSum('Days', 28, 0) > 0"))
+            assertTrue(evalJexl("'sync_auth_sign_in'|eventSum('Days', 28, 0) > 0"))
         }
     }
 }
diff --git a/app/src/main/java/org/mozilla/fenix/components/BackgroundServices.kt b/app/src/main/java/org/mozilla/fenix/components/BackgroundServices.kt
index e4c5efa0b..f40dbb4ce 100644
--- a/app/src/main/java/org/mozilla/fenix/components/BackgroundServices.kt
+++ b/app/src/main/java/org/mozilla/fenix/components/BackgroundServices.kt
@@ -126,7 +126,7 @@ class BackgroundServices(
     }
 
     private val telemetryAccountObserver = TelemetryAccountObserver(
-        context
+        context,
     )
 
     val accountAbnormalities = AccountAbnormalities(context, crashReporter, strictMode)
@@ -218,7 +218,7 @@ private class AccountManagerReadyObserver(
 
 @VisibleForTesting(otherwise = PRIVATE)
 internal class TelemetryAccountObserver(
-    private val context: Context
+    private val context: Context,
 ) : AccountObserver {
     override fun onAuthenticated(account: OAuthAccount, authType: AuthType) {
         context.settings().signedInFxaAccount = true
diff --git a/app/src/test/java/org/mozilla/fenix/components/BackgroundServicesTest.kt b/app/src/test/java/org/mozilla/fenix/components/BackgroundServicesTest.kt
index f865fb907..c6d5fe246 100644
--- a/app/src/test/java/org/mozilla/fenix/components/BackgroundServicesTest.kt
+++ b/app/src/test/java/org/mozilla/fenix/components/BackgroundServicesTest.kt
@@ -4,6 +4,7 @@
 
 package org.mozilla.fenix.components
 
+import android.content.Context
 import io.mockk.MockKAnnotations
 import io.mockk.Runs
 import io.mockk.confirmVerified
@@ -15,6 +16,7 @@ import io.mockk.verify
 import mozilla.components.concept.sync.AccountObserver
 import mozilla.components.concept.sync.AuthType
 import mozilla.components.concept.sync.OAuthAccount
+import mozilla.components.service.nimbus.NimbusApi
 import mozilla.components.support.base.observer.ObserverRegistry
 import mozilla.components.support.test.robolectric.testContext
 import mozilla.telemetry.glean.testing.GleanTestRule
@@ -24,6 +26,7 @@ import org.junit.Rule
 import org.junit.Test
 import org.junit.runner.RunWith
 import org.mozilla.fenix.GleanMetrics.SyncAuth
+import org.mozilla.fenix.ext.components
 import org.mozilla.fenix.helpers.FenixRobolectricTestRunner
 import org.mozilla.fenix.utils.Settings
 
@@ -34,9 +37,15 @@ class BackgroundServicesTest {
     @get:Rule
     val gleanTestRule = GleanTestRule(testContext)
 
+    @MockK
+    private lateinit var context: Context
+
     @MockK
     private lateinit var settings: Settings
 
+    @MockK
+    private lateinit var nimbus: NimbusApi
+
     private lateinit var observer: TelemetryAccountObserver
     private lateinit var registry: ObserverRegistry<AccountObserver>
 
@@ -45,7 +54,15 @@ class BackgroundServicesTest {
         MockKAnnotations.init(this)
         every { settings.signedInFxaAccount = any() } just Runs
 
-        observer = TelemetryAccountObserver(settings)
+        val mockComponents: Components = mockk()
+        every { mockComponents.settings } returns settings
+        every { mockComponents.analytics } returns mockk {
+            every { experiments } returns nimbus
+        }
+        every { context.components } returns mockComponents
+        every { nimbus.recordEvent(any()) } returns Unit
+
+        observer = TelemetryAccountObserver(context)
         registry = ObserverRegistry<AccountObserver>().apply { register(observer) }
     }
 
@@ -123,4 +140,13 @@ class BackgroundServicesTest {
         verify { settings.signedInFxaAccount = false }
         confirmVerified(settings)
     }
+
+    @Test
+    fun `telemetry account observer records nimbus event for logins`() {
+        observer.onAuthenticated(mockk(), AuthType.Signin)
+        verify {
+            nimbus.recordEvent("sync_auth_sign_in")
+        }
+        confirmVerified(nimbus)
+    }
 }