diff --git a/app/src/main/java/com/aurora/store/compose/navigation/NavDisplay.kt b/app/src/main/java/com/aurora/store/compose/navigation/NavDisplay.kt
index fb8c6d988..96ff65379 100644
--- a/app/src/main/java/com/aurora/store/compose/navigation/NavDisplay.kt
+++ b/app/src/main/java/com/aurora/store/compose/navigation/NavDisplay.kt
@@ -1,4 +1,5 @@
 /*
+ * SPDX-FileCopyrightText: 2026 Aurora OSS
  * SPDX-FileCopyrightText: 2025 The Calyx Institute
  * SPDX-License-Identifier: GPL-3.0-or-later
  */
@@ -8,7 +9,10 @@ package com.aurora.store.compose.navigation
 import android.content.Intent
 import androidx.activity.compose.LocalActivity
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.ui.platform.LocalContext
+import androidx.lifecycle.Lifecycle
+import androidx.lifecycle.compose.LifecycleEventEffect
 import androidx.lifecycle.viewmodel.navigation3.rememberViewModelStoreNavEntryDecorator
 import androidx.navigation.NavDeepLinkBuilder
 import androidx.navigation3.runtime.NavKey
@@ -16,6 +20,10 @@ import androidx.navigation3.runtime.entryProvider
 import androidx.navigation3.runtime.rememberNavBackStack
 import androidx.navigation3.runtime.rememberSaveableStateHolderNavEntryDecorator
 import androidx.navigation3.ui.NavDisplay
+import com.aurora.Constants.PACKAGE_NAME_GMS
+import com.aurora.extensions.toast
+import com.aurora.store.AuroraApp
+import com.aurora.store.ComposeActivity
 import com.aurora.store.MainActivity
 import com.aurora.store.R
 import com.aurora.store.compose.ui.about.AboutScreen
@@ -33,6 +41,11 @@ import com.aurora.store.compose.ui.onboarding.OnboardingScreen
 import com.aurora.store.compose.ui.preferences.installation.InstallerScreen
 import com.aurora.store.compose.ui.search.SearchScreen
 import com.aurora.store.compose.ui.spoof.SpoofScreen
+import com.aurora.store.data.event.InstallerEvent
+import com.aurora.store.data.model.AccountType
+import com.aurora.store.data.providers.AccountProvider
+import com.aurora.store.util.PackageUtil
+import com.aurora.store.util.Preferences
 
 /**
  * Navigation display for compose screens
@@ -58,6 +71,36 @@ fun NavDisplay(startDestination: NavKey) {
         if (backstack.size == 1) activity?.finish() else backstack.removeLastOrNull()
     }
 
+    val context = LocalContext.current
+
+    fun isMicroGAuthInvalidated(): Boolean =
+        Preferences.getBoolean(context, Preferences.PREFERENCE_AUTH_VIA_MICROG, false) &&
+            AccountProvider.getAccountType(context) == AccountType.GOOGLE &&
+            !PackageUtil.hasSupportedMicroGVariant(context)
+
+    fun handleMicroGRemoved() {
+        context.toast(R.string.microg_removed_auth_warning)
+        AccountProvider.logout(context)
+        val intent = Intent(context, ComposeActivity::class.java).apply {
+            addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK or Intent.FLAG_ACTIVITY_NEW_TASK)
+        }
+        context.startActivity(intent)
+    }
+
+    // Check every time the screen resumes in case microG was removed while Aurora was in background.
+    LifecycleEventEffect(Lifecycle.Event.ON_RESUME) {
+        if (isMicroGAuthInvalidated()) handleMicroGRemoved()
+    }
+
+    // Also react immediately if the GMS package is uninstalled while Aurora is in the foreground.
+    LaunchedEffect(Unit) {
+        AuroraApp.events.installerEvent.collect { event ->
+            if (event is InstallerEvent.Uninstalled && event.packageName == PACKAGE_NAME_GMS) {
+                if (isMicroGAuthInvalidated()) handleMicroGRemoved()
+            }
+        }
+    }
+
     NavDisplay(
         backStack = backstack,
         entryDecorators = listOf(
diff --git a/app/src/main/java/com/aurora/store/data/providers/AccountProvider.kt b/app/src/main/java/com/aurora/store/data/providers/AccountProvider.kt
index 156c4ee9f..f571a8a9f 100644
--- a/app/src/main/java/com/aurora/store/data/providers/AccountProvider.kt
+++ b/app/src/main/java/com/aurora/store/data/providers/AccountProvider.kt
@@ -80,5 +80,6 @@ object AccountProvider {
         Preferences.remove(context, Constants.ACCOUNT_EMAIL_PLAIN)
         Preferences.remove(context, Constants.ACCOUNT_AAS_PLAIN)
         Preferences.remove(context, Constants.ACCOUNT_AUTH_PLAIN)
+        Preferences.remove(context, Preferences.PREFERENCE_AUTH_VIA_MICROG)
     }
 }
diff --git a/app/src/main/java/com/aurora/store/util/Preferences.kt b/app/src/main/java/com/aurora/store/util/Preferences.kt
index 38bf4f06d..73a9ec17f 100644
--- a/app/src/main/java/com/aurora/store/util/Preferences.kt
+++ b/app/src/main/java/com/aurora/store/util/Preferences.kt
@@ -48,6 +48,7 @@ object Preferences {
     const val PREFERENCE_PROXY_INFO = "PREFERENCE_PROXY_INFO"
 
     const val PREFERENCE_MICROG_AUTH = "PREFERENCE_MICROG_AUTH"
+    const val PREFERENCE_AUTH_VIA_MICROG = "PREFERENCE_AUTH_VIA_MICROG"
 
     const val PREFERENCE_DISPENSER_URLS = "PREFERENCE_DISPENSER_URLS"
     const val PREFERENCE_VENDING_VERSION = "PREFERENCE_VENDING_VERSION"
diff --git a/app/src/main/java/com/aurora/store/viewmodel/auth/AuthViewModel.kt b/app/src/main/java/com/aurora/store/viewmodel/auth/AuthViewModel.kt
index 7b092443c..20a06c9b3 100644
--- a/app/src/main/java/com/aurora/store/viewmodel/auth/AuthViewModel.kt
+++ b/app/src/main/java/com/aurora/store/viewmodel/auth/AuthViewModel.kt
@@ -35,6 +35,7 @@ import com.aurora.store.data.model.AuthState
 import com.aurora.store.data.providers.AccountProvider
 import com.aurora.store.data.providers.AuthProvider
 import com.aurora.store.util.AC2DMTask
+import com.aurora.store.util.PackageUtil
 import com.aurora.store.util.Preferences
 import dagger.hilt.android.lifecycle.HiltViewModel
 import dagger.hilt.android.qualifiers.ApplicationContext
@@ -171,13 +172,26 @@ class AuthViewModel @Inject constructor(
         _authState.value = AuthState.Verifying
         if (authData.authToken.isNotEmpty() && authData.deviceConfigToken.isNotEmpty()) {
             authProvider.saveAuthData(authData)
+            val tokenType =
+                if (authData.aasToken.isBlank()) AuthHelper.Token.AUTH else AuthHelper.Token.AAS
             AccountProvider.login(
                 context,
                 authData.email,
-                authData.aasToken.ifBlank { authData.authToken },
-                if (authData.aasToken.isBlank()) AuthHelper.Token.AUTH else AuthHelper.Token.AAS,
+                authData.aasToken.ifBlank {
+                    authData.authToken
+                },
+                tokenType,
                 accountType
             )
+            // Record whether this Google session relies on microG's AccountManager so we
+            // can warn the user if microG is later uninstalled.
+            Preferences.putBoolean(
+                context,
+                Preferences.PREFERENCE_AUTH_VIA_MICROG,
+                accountType == AccountType.GOOGLE &&
+                    tokenType == AuthHelper.Token.AUTH &&
+                    PackageUtil.hasSupportedMicroGVariant(context)
+            )
             _authState.value = AuthState.SignedIn
         } else {
             authProvider.removeAuthData(context)
diff --git a/app/src/main/java/com/aurora/store/viewmodel/details/AppDetailsViewModel.kt b/app/src/main/java/com/aurora/store/viewmodel/details/AppDetailsViewModel.kt
index 16e24ecf9..1669913ce 100644
--- a/app/src/main/java/com/aurora/store/viewmodel/details/AppDetailsViewModel.kt
+++ b/app/src/main/java/com/aurora/store/viewmodel/details/AppDetailsViewModel.kt
@@ -16,6 +16,7 @@ import com.aurora.extensions.TAG
 import com.aurora.extensions.requiresGMS
 import com.aurora.gplayapi.data.models.App
 import com.aurora.gplayapi.data.models.Review
+import com.aurora.gplayapi.data.models.datasafety.Report as DataSafetyReport
 import com.aurora.gplayapi.data.models.details.TestingProgramStatus
 import com.aurora.gplayapi.helpers.AppDetailsHelper
 import com.aurora.gplayapi.helpers.ReviewsHelper
@@ -41,6 +42,7 @@ import com.aurora.store.util.Preferences
 import com.aurora.store.util.Preferences.PREFERENCE_UPDATES_EXTENDED
 import dagger.hilt.android.lifecycle.HiltViewModel
 import dagger.hilt.android.qualifiers.ApplicationContext
+import javax.inject.Inject
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.SharingStarted
@@ -54,8 +56,6 @@ import kotlinx.coroutines.flow.stateIn
 import kotlinx.coroutines.launch
 import kotlinx.serialization.json.Json
 import org.json.JSONObject
-import javax.inject.Inject
-import com.aurora.gplayapi.data.models.datasafety.Report as DataSafetyReport
 
 @HiltViewModel
 class AppDetailsViewModel @Inject constructor(
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 4b71e8316..c7df15ff0 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -392,6 +392,7 @@
     <string name="native_installer_desc">Best suited for devices running below Android 4.4</string>
     <string name="services_installer_subtitle">Installer for background installations</string>
     <string name="services_installer_desc">Requires Aurora Services to be installed as a privileged-system app</string>
+    <string name="microg_removed_auth_warning">microG is no longer installed. Run setup again to keep things working smoothly.</string>
     <string name="microg_installer_subtitle">Requires microG companion app to be installed</string>
     <string name="microg_installer_desc">Helps you bypass App Integrity (installer only) check</string>
     <string name="am_installer_subtitle">Full-featured open source package manager</string>