diff --git a/services/core/java/com/android/server/notification/NotificationManagerService.java b/services/core/java/com/android/server/notification/NotificationManagerService.java
index bff3d39..9d4ab11 100755
--- a/services/core/java/com/android/server/notification/NotificationManagerService.java
+++ b/services/core/java/com/android/server/notification/NotificationManagerService.java
@@ -266,7 +266,6 @@
 import android.os.UserManager;
 import android.os.WorkSource;
 import android.permission.PermissionManager;
-import android.provider.DeviceConfig;
 import android.provider.Settings;
 import android.provider.Settings.Secure;
 import android.service.notification.Adjustment;
@@ -313,7 +312,6 @@
 import com.android.internal.annotations.GuardedBy;
 import com.android.internal.annotations.VisibleForTesting;
 import com.android.internal.compat.IPlatformCompat;
-import com.android.internal.config.sysui.SystemUiDeviceConfigFlags;
 import com.android.internal.config.sysui.SystemUiSystemPropertiesFlags;
 import com.android.internal.config.sysui.SystemUiSystemPropertiesFlags.NotificationFlags;
 import com.android.internal.logging.InstanceId;
@@ -704,7 +702,6 @@
     private ConditionProviders mConditionProviders;
     private NotificationUsageStats mUsageStats;
     private boolean mLockScreenAllowSecureNotifications = true;
-    boolean mSystemExemptFromDismissal = false;
     final ArrayMap<String, ArrayMap<Integer,
             RemoteCallbackList<ICallNotificationEventCallback>>>
             mCallNotificationEventCallbacks = new ArrayMap<>();
@@ -722,7 +719,6 @@
     private GroupHelper mGroupHelper;
     private int mAutoGroupAtCount;
     private boolean mIsTelevision;
-    private DeviceConfig.OnPropertiesChangedListener mDeviceConfigChangedListener;
     protected NotificationAttentionHelper mAttentionHelper;
 
     private int mWarnRemoteViewsSizeBytes;
@@ -973,18 +969,6 @@
     }
 
     protected void setDefaultAssistantForUser(int userId) {
-        String overrideDefaultAssistantString = DeviceConfig.getProperty(
-                DeviceConfig.NAMESPACE_SYSTEMUI,
-                SystemUiDeviceConfigFlags.NAS_DEFAULT_SERVICE);
-        if (overrideDefaultAssistantString != null) {
-            ArraySet<ComponentName> approved = mAssistants.queryPackageForServices(
-                    overrideDefaultAssistantString,
-                    MATCH_DIRECT_BOOT_AWARE | MATCH_DIRECT_BOOT_UNAWARE,
-                    userId);
-            for (int i = 0; i < approved.size(); i++) {
-                if (allowAssistant(userId, approved.valueAt(i))) return;
-            }
-        }
         ArraySet<ComponentName> defaults = mAssistants.getDefaultComponents();
         // We should have only one default assistant by default
         // allowAssistant should execute once in practice
@@ -2670,10 +2654,6 @@
         mStatsManager.clearPullAtomCallback(DND_MODE_RULE);
         mAppOps.stopWatchingMode(mAppOpsListener);
         mAlarmManager.cancelAll();
-
-        if (mDeviceConfigChangedListener != null) {
-            DeviceConfig.removeOnPropertiesChangedListener(mDeviceConfigChangedListener);
-        }
     }
 
     protected String[] getStringArrayResource(int key) {
@@ -2744,27 +2724,6 @@
         publishLocalService(NotificationManagerInternal.class, mInternalService);
     }
 
-    void registerDeviceConfigChange() {
-        mDeviceConfigChangedListener = properties -> {
-            if (!DeviceConfig.NAMESPACE_SYSTEMUI.equals(properties.getNamespace())) {
-                return;
-            }
-            for (String name : properties.getKeyset()) {
-                if (SystemUiDeviceConfigFlags.NAS_DEFAULT_SERVICE.equals(name)) {
-                    mAssistants.resetDefaultAssistantsIfNecessary();
-                }
-            }
-        };
-        mSystemExemptFromDismissal = DeviceConfig.getBoolean(
-                DeviceConfig.NAMESPACE_DEVICE_POLICY_MANAGER,
-                /* name= */ "application_exemptions",
-                /* defaultValue= */ true);
-        DeviceConfig.addOnPropertiesChangedListener(
-                DeviceConfig.NAMESPACE_SYSTEMUI,
-                new HandlerExecutor(mHandler),
-                mDeviceConfigChangedListener);
-    }
-
     private void registerNotificationPreferencesPullers() {
         mPullAtomCallback = new StatsPullAtomCallbackImpl();
         mStatsManager.setPullAtomCallback(
@@ -2938,7 +2897,6 @@
             mAssistants.onBootPhaseAppsCanStart();
             mConditionProviders.onBootPhaseAppsCanStart();
             mHistoryManager.onBootPhaseAppsCanStart();
-            registerDeviceConfigChange();
             migrateDefaultNAS();
             maybeShowInitialReviewPermissionsNotification();
 
@@ -7738,7 +7696,7 @@
             return true;
         }
         // Check if an app has been given system exemption
-        return mSystemExemptFromDismissal && mAppOps.checkOpNoThrow(
+        return mAppOps.checkOpNoThrow(
                 AppOpsManager.OP_SYSTEM_EXEMPT_FROM_DISMISSIBLE_NOTIFICATIONS, ai.uid,
                 ai.packageName) == MODE_ALLOWED;
     }
diff --git a/services/tests/uiservicestests/src/com/android/server/notification/NotificationManagerServiceTest.java b/services/tests/uiservicestests/src/com/android/server/notification/NotificationManagerServiceTest.java
index ce7a0a0..74d8433 100755
--- a/services/tests/uiservicestests/src/com/android/server/notification/NotificationManagerServiceTest.java
+++ b/services/tests/uiservicestests/src/com/android/server/notification/NotificationManagerServiceTest.java
@@ -243,7 +243,6 @@
 import android.platform.test.flag.junit.FlagsParameterization;
 import android.platform.test.flag.junit.SetFlagsRule;
 import android.platform.test.rule.LimitDevicesRule;
-import android.provider.DeviceConfig;
 import android.provider.MediaStore;
 import android.provider.Settings;
 import android.service.notification.Adjustment;
@@ -280,7 +279,6 @@
 import androidx.test.filters.SmallTest;
 
 import com.android.internal.R;
-import com.android.internal.config.sysui.SystemUiDeviceConfigFlags;
 import com.android.internal.config.sysui.TestableFlagResolver;
 import com.android.internal.logging.InstanceIdSequence;
 import com.android.internal.logging.InstanceIdSequenceFake;
@@ -602,7 +600,9 @@
         when(mContext.getContentResolver()).thenReturn(cr);
         doNothing().when(cr).registerContentObserver(any(), anyBoolean(), any(), anyInt());
 
-        setDpmAppOppsExemptFromDismissal(false);
+        when(mAppOpsManager.checkOpNoThrow(
+                AppOpsManager.OP_SYSTEM_EXEMPT_FROM_DISMISSIBLE_NOTIFICATIONS, mUid,
+                mPkg)).thenReturn(AppOpsManager.MODE_IGNORED);
 
         // Use this testable looper.
         mTestableLooper = TestableLooper.get(this);
@@ -900,7 +900,6 @@
     @After
     public void tearDown() throws Exception {
         if (mFile != null) mFile.delete();
-        clearDeviceConfig();
 
         if (mActivityIntent != null) {
             mActivityIntent.cancel();
@@ -1200,19 +1199,6 @@
         return answers;
     }
 
-    private void clearDeviceConfig() {
-        DeviceConfig.resetToDefaults(
-                Settings.RESET_MODE_PACKAGE_DEFAULTS, DeviceConfig.NAMESPACE_SYSTEMUI);
-    }
-
-    private void setDefaultAssistantInDeviceConfig(String componentName) {
-        DeviceConfig.setProperty(
-                DeviceConfig.NAMESPACE_SYSTEMUI,
-                SystemUiDeviceConfigFlags.NAS_DEFAULT_SERVICE,
-                componentName,
-                false);
-    }
-
     private Notification.Builder getMessageStyleNotifBuilder(boolean addBubbleMetadata,
             String groupKey, boolean isSummary, boolean mutable) {
         // Give it a person
@@ -9092,7 +9078,6 @@
 
     @Test
     public void setDefaultAssistantForUser_fromConfigXml() {
-        clearDeviceConfig();
         ComponentName xmlConfig = new ComponentName("config", "xml");
         ArraySet<ComponentName> components = new ArraySet<>(Arrays.asList(xmlConfig));
         when(mResources
@@ -9115,51 +9100,6 @@
     }
 
     @Test
-    public void setDefaultAssistantForUser_fromDeviceConfig() {
-        ComponentName xmlConfig = new ComponentName("xml", "config");
-        ComponentName deviceConfig = new ComponentName("device", "config");
-        setDefaultAssistantInDeviceConfig(deviceConfig.flattenToString());
-        when(mResources
-                .getString(com.android.internal.R.string.config_defaultAssistantAccessComponent))
-                .thenReturn(xmlConfig.flattenToString());
-        when(mContext.getResources()).thenReturn(mResources);
-        when(mAssistants.queryPackageForServices(eq(null), anyInt(), anyInt()))
-                .thenReturn(new ArraySet<>(Arrays.asList(xmlConfig, deviceConfig)));
-        when(mAssistants.getDefaultComponents())
-                .thenReturn(new ArraySet<>(Arrays.asList(deviceConfig)));
-        mService.setNotificationAssistantAccessGrantedCallback(
-                mNotificationAssistantAccessGrantedCallback);
-
-        mService.setDefaultAssistantForUser(0);
-
-        verify(mNotificationAssistantAccessGrantedCallback)
-                .onGranted(eq(deviceConfig), eq(0), eq(true), eq(false));
-    }
-
-    @Test
-    public void setDefaultAssistantForUser_deviceConfigInvalid() {
-        ComponentName xmlConfig = new ComponentName("xml", "config");
-        ComponentName deviceConfig = new ComponentName("device", "config");
-        setDefaultAssistantInDeviceConfig(deviceConfig.flattenToString());
-        when(mResources
-                .getString(com.android.internal.R.string.config_defaultAssistantAccessComponent))
-                .thenReturn(xmlConfig.flattenToString());
-        when(mContext.getResources()).thenReturn(mResources);
-        // Only xmlConfig is valid, deviceConfig is not.
-        when(mAssistants.queryPackageForServices(eq(null), anyInt(), eq(0)))
-                .thenReturn(new ArraySet<>(Collections.singleton(xmlConfig)));
-        when(mAssistants.getDefaultComponents())
-                .thenReturn(new ArraySet<>(Arrays.asList(xmlConfig, deviceConfig)));
-        mService.setNotificationAssistantAccessGrantedCallback(
-                mNotificationAssistantAccessGrantedCallback);
-
-        mService.setDefaultAssistantForUser(0);
-
-        verify(mNotificationAssistantAccessGrantedCallback)
-                .onGranted(eq(xmlConfig), eq(0), eq(true), eq(false));
-    }
-
-    @Test
     public void clearMultipleDefaultAssistantPackagesShouldEnableOnlyOne() throws RemoteException {
         ArrayMap<Boolean, ArrayList<ComponentName>> changedListeners =
                 generateResetComponentValues();
@@ -11006,7 +10946,6 @@
         tr.addOverride(com.android.internal.R.string.config_defaultListenerAccessPackages, "");
         tr.addOverride(com.android.internal.R.string.config_defaultDndAccessPackages, "");
         tr.addOverride(com.android.internal.R.string.config_defaultAssistantAccessComponent, "");
-        setDefaultAssistantInDeviceConfig("");
 
         mService.loadDefaultApprovedServices(USER_SYSTEM);
 
@@ -13425,7 +13364,6 @@
             throws Exception {
         when(mDevicePolicyManager.isActiveDeviceOwner(mUid)).thenReturn(true);
         // Given: a notification has the flag FLAG_ONGOING_EVENT set
-        setDpmAppOppsExemptFromDismissal(false);
         Notification n = new Notification.Builder(mContext, "test")
                 .setOngoing(true)
                 .build();
@@ -13451,7 +13389,6 @@
                 AppOpsManager.OP_SYSTEM_EXEMPT_FROM_DISMISSIBLE_NOTIFICATIONS, mUid,
                 mPkg)).thenReturn(AppOpsManager.MODE_ALLOWED);
         // Given: a notification has the flag FLAG_ONGOING_EVENT set
-        setDpmAppOppsExemptFromDismissal(true);
         Notification n = new Notification.Builder(mContext, "test")
                 .setOngoing(true)
                 .build();
@@ -13459,8 +13396,8 @@
         // When: fix the notification with NotificationManagerService
         mService.fixNotification(n, mPkg, "tag", 9, 0, mUid, NOT_FOREGROUND_SERVICE, true);
 
-        // Then: the notification's flag FLAG_NO_DISMISS should be cleared
-        assertEquals(0, n.flags & Notification.FLAG_NO_DISMISS);
+        // Then: the notification's flag FLAG_NO_DISMISS should be set
+        assertNotSame(0, n.flags & Notification.FLAG_NO_DISMISS);
     }
 
     @Test
@@ -13468,9 +13405,8 @@
             throws Exception {
         when(mAppOpsManager.checkOpNoThrow(
                 AppOpsManager.OP_SYSTEM_EXEMPT_FROM_DISMISSIBLE_NOTIFICATIONS, mUid,
-                mPkg)).thenReturn(AppOpsManager.MODE_ALLOWED);
+                mPkg)).thenReturn(AppOpsManager.MODE_IGNORED);
         // Given: a notification has the flag FLAG_ONGOING_EVENT set
-        setDpmAppOppsExemptFromDismissal(false);
         Notification n = new Notification.Builder(mContext, "test")
                 .setOngoing(true)
                 .build();
@@ -15551,14 +15487,6 @@
                 PendingIntent.FLAG_MUTABLE);
     }
 
-    private void setDpmAppOppsExemptFromDismissal(boolean isOn) {
-        DeviceConfig.setProperty(
-                DeviceConfig.NAMESPACE_DEVICE_POLICY_MANAGER,
-                /* name= */ "application_exemptions",
-                String.valueOf(isOn),
-                /* makeDefault= */ false);
-    }
-
     private void allowTestPackageToToast() throws Exception {
         assertWithMessage("toast queue").that(mService.mToastQueue).isEmpty();
         mService.isSystemUid = false;