diff --git a/services/core/java/com/android/server/biometrics/sensors/fingerprint/FingerprintService.java b/services/core/java/com/android/server/biometrics/sensors/fingerprint/FingerprintService.java
index 012e47e425f64..183fabdc2a7b0 100644
--- a/services/core/java/com/android/server/biometrics/sensors/fingerprint/FingerprintService.java
+++ b/services/core/java/com/android/server/biometrics/sensors/fingerprint/FingerprintService.java
@@ -215,9 +215,9 @@ public class FingerprintService extends SystemService {
         }
 
         @Override // Binder call
-        public void enroll(final IBinder token, final byte[] hardwareAuthToken, final int userId,
-                final IFingerprintServiceReceiver receiver, final String opPackageName,
-                @FingerprintManager.EnrollReason int enrollReason) {
+        public void enroll(final IBinder token, @NonNull final byte[] hardwareAuthToken,
+                final int userId, final IFingerprintServiceReceiver receiver,
+                final String opPackageName, @FingerprintManager.EnrollReason int enrollReason) {
             Utils.checkPermission(getContext(), MANAGE_FINGERPRINT);
 
             final Pair<Integer, ServiceProvider> provider = getSingleProvider();
diff --git a/services/core/java/com/android/server/biometrics/sensors/fingerprint/ServiceProvider.java b/services/core/java/com/android/server/biometrics/sensors/fingerprint/ServiceProvider.java
index 3a214f44c0a8e..706ac10137467 100644
--- a/services/core/java/com/android/server/biometrics/sensors/fingerprint/ServiceProvider.java
+++ b/services/core/java/com/android/server/biometrics/sensors/fingerprint/ServiceProvider.java
@@ -85,9 +85,12 @@ public interface ServiceProvider {
     void scheduleRevokeChallenge(int sensorId, int userId, @NonNull IBinder token,
             @NonNull String opPackageName, long challenge);
 
-    void scheduleEnroll(int sensorId, @NonNull IBinder token, byte[] hardwareAuthToken, int userId,
-            @NonNull IFingerprintServiceReceiver receiver, @NonNull String opPackageName,
-            @FingerprintManager.EnrollReason int enrollReason,
+    /**
+     * Schedules fingerprint enrollment.
+     */
+    void scheduleEnroll(int sensorId, @NonNull IBinder token, @NonNull byte[] hardwareAuthToken,
+            int userId, @NonNull IFingerprintServiceReceiver receiver,
+            @NonNull String opPackageName, @FingerprintManager.EnrollReason int enrollReason,
             @NonNull FingerprintStateCallback fingerprintStateCallback);
 
     void cancelEnrollment(int sensorId, @NonNull IBinder token);
diff --git a/services/core/java/com/android/server/biometrics/sensors/fingerprint/aidl/FingerprintProvider.java b/services/core/java/com/android/server/biometrics/sensors/fingerprint/aidl/FingerprintProvider.java
index cfc4674303490..102b074931342 100644
--- a/services/core/java/com/android/server/biometrics/sensors/fingerprint/aidl/FingerprintProvider.java
+++ b/services/core/java/com/android/server/biometrics/sensors/fingerprint/aidl/FingerprintProvider.java
@@ -329,9 +329,10 @@ public class FingerprintProvider implements IBinder.DeathRecipient, ServiceProvi
     }
 
     @Override
-    public void scheduleEnroll(int sensorId, @NonNull IBinder token, byte[] hardwareAuthToken,
-            int userId, @NonNull IFingerprintServiceReceiver receiver,
-            @NonNull String opPackageName, @FingerprintManager.EnrollReason int enrollReason,
+    public void scheduleEnroll(int sensorId, @NonNull IBinder token,
+            @NonNull byte[] hardwareAuthToken, int userId,
+            @NonNull IFingerprintServiceReceiver receiver, @NonNull String opPackageName,
+            @FingerprintManager.EnrollReason int enrollReason,
             @NonNull FingerprintStateCallback fingerprintStateCallback) {
         mHandler.post(() -> {
             final int maxTemplatesPerUser = mSensors.get(sensorId).getSensorProperties()
diff --git a/services/core/java/com/android/server/locksettings/LockSettingsService.java b/services/core/java/com/android/server/locksettings/LockSettingsService.java
index 0bec09cd003f9..c0b8648b53288 100644
--- a/services/core/java/com/android/server/locksettings/LockSettingsService.java
+++ b/services/core/java/com/android/server/locksettings/LockSettingsService.java
@@ -2174,6 +2174,7 @@ public class LockSettingsService extends ILockSettings.Stub {
     @Override
     public VerifyCredentialResponse verifyGatekeeperPasswordHandle(long gatekeeperPasswordHandle,
             long challenge, int userId) {
+
         checkPasswordReadPermission();
 
         final VerifyCredentialResponse response;
@@ -2185,6 +2186,7 @@ public class LockSettingsService extends ILockSettings.Stub {
 
         synchronized (mSpManager) {
             if (gatekeeperPassword == null) {
+                Slog.d(TAG, "No gatekeeper password for handle");
                 response = VerifyCredentialResponse.ERROR;
             } else {
                 response = mSpManager.verifyChallengeInternal(getGateKeeperService(),