diff --git a/services/core/java/com/android/server/biometrics/sensors/BiometricScheduler.java b/services/core/java/com/android/server/biometrics/sensors/BiometricScheduler.java
index 1f91c4d..39c5944 100644
--- a/services/core/java/com/android/server/biometrics/sensors/BiometricScheduler.java
+++ b/services/core/java/com/android/server/biometrics/sensors/BiometricScheduler.java
@@ -25,6 +25,7 @@
 import android.hardware.fingerprint.FingerprintSensorPropertiesInternal;
 import android.os.Handler;
 import android.os.IBinder;
+import android.os.Looper;
 import android.os.RemoteException;
 import android.os.ServiceManager;
 import android.util.Slog;
@@ -232,17 +233,14 @@
      * Creates a new scheduler.
      *
      * @param tag for the specific instance of the scheduler. Should be unique.
-     * @param handler handler for callbacks (all methods of this class must be called on the
-     *                thread associated with this handler)
      * @param sensorType the sensorType that this scheduler is handling.
      * @param gestureAvailabilityDispatcher may be null if the sensor does not support gestures
      *                                      (such as fingerprint swipe).
      */
     public BiometricScheduler(@NonNull String tag,
-            @NonNull Handler handler,
             @SensorType int sensorType,
             @Nullable GestureAvailabilityDispatcher gestureAvailabilityDispatcher) {
-        this(tag, handler, sensorType, gestureAvailabilityDispatcher,
+        this(tag, new Handler(Looper.getMainLooper()), sensorType, gestureAvailabilityDispatcher,
                 IBiometricService.Stub.asInterface(
                         ServiceManager.getService(Context.BIOMETRIC_SERVICE)),
                 LOG_NUM_RECENT_OPERATIONS, CoexCoordinator.getInstance());
@@ -376,8 +374,9 @@
         // send ERROR_CANCELED and skip the operation.
         if (clientMonitor.interruptsPrecedingClients()) {
             for (BiometricSchedulerOperation operation : mPendingOperations) {
-                Slog.d(getTag(), "New client, marking pending op as canceling: " + operation);
-                operation.markCanceling();
+                if (operation.markCanceling()) {
+                    Slog.d(getTag(), "New client, marking pending op as canceling: " + operation);
+                }
             }
         }
 
diff --git a/services/core/java/com/android/server/biometrics/sensors/BiometricSchedulerOperation.java b/services/core/java/com/android/server/biometrics/sensors/BiometricSchedulerOperation.java
index a8cce15..e8b50d9 100644
--- a/services/core/java/com/android/server/biometrics/sensors/BiometricSchedulerOperation.java
+++ b/services/core/java/com/android/server/biometrics/sensors/BiometricSchedulerOperation.java
@@ -225,12 +225,13 @@
         Slog.v(TAG, "Aborted: " + this);
     }
 
-    /** Flags this operation as canceled, but does not cancel it until started. */
-    public void markCanceling() {
+    /** Flags this operation as canceled, if possible, but does not cancel it until started. */
+    public boolean markCanceling() {
         if (mState == STATE_WAITING_IN_QUEUE && isInterruptable()) {
             mState = STATE_WAITING_IN_QUEUE_CANCELING;
-            Slog.v(TAG, "Marked cancelling: " + this);
+            return true;
         }
+        return false;
     }
 
     /**
@@ -280,6 +281,7 @@
             @Override
             public void onClientFinished(@NonNull BaseClientMonitor clientMonitor,
                     boolean success) {
+                Slog.d(TAG, "[Finished / destroy]: " + clientMonitor);
                 mClientMonitor.destroy();
                 mState = STATE_FINISHED;
             }
diff --git a/services/core/java/com/android/server/biometrics/sensors/UserAwareBiometricScheduler.java b/services/core/java/com/android/server/biometrics/sensors/UserAwareBiometricScheduler.java
index 19eaa17..603cc22 100644
--- a/services/core/java/com/android/server/biometrics/sensors/UserAwareBiometricScheduler.java
+++ b/services/core/java/com/android/server/biometrics/sensors/UserAwareBiometricScheduler.java
@@ -23,6 +23,7 @@
 import android.content.Context;
 import android.hardware.biometrics.IBiometricService;
 import android.os.Handler;
+import android.os.Looper;
 import android.os.ServiceManager;
 import android.os.UserHandle;
 import android.util.Slog;
@@ -85,7 +86,7 @@
     }
 
     @VisibleForTesting
-    UserAwareBiometricScheduler(@NonNull String tag,
+    public UserAwareBiometricScheduler(@NonNull String tag,
             @NonNull Handler handler,
             @SensorType int sensorType,
             @Nullable GestureAvailabilityDispatcher gestureAvailabilityDispatcher,
@@ -101,12 +102,11 @@
     }
 
     public UserAwareBiometricScheduler(@NonNull String tag,
-            @NonNull Handler handler,
             @SensorType int sensorType,
             @Nullable GestureAvailabilityDispatcher gestureAvailabilityDispatcher,
             @NonNull CurrentUserRetriever currentUserRetriever,
             @NonNull UserSwitchCallback userSwitchCallback) {
-        this(tag, handler, sensorType, gestureAvailabilityDispatcher,
+        this(tag, new Handler(Looper.getMainLooper()), sensorType, gestureAvailabilityDispatcher,
                 IBiometricService.Stub.asInterface(
                         ServiceManager.getService(Context.BIOMETRIC_SERVICE)),
                 currentUserRetriever, userSwitchCallback, CoexCoordinator.getInstance());
diff --git a/services/core/java/com/android/server/biometrics/sensors/face/aidl/Sensor.java b/services/core/java/com/android/server/biometrics/sensors/face/aidl/Sensor.java
index 3927043..206b8f0 100644
--- a/services/core/java/com/android/server/biometrics/sensors/face/aidl/Sensor.java
+++ b/services/core/java/com/android/server/biometrics/sensors/face/aidl/Sensor.java
@@ -494,7 +494,7 @@
         mToken = new Binder();
         mHandler = handler;
         mSensorProperties = sensorProperties;
-        mScheduler = new UserAwareBiometricScheduler(tag, mHandler,
+        mScheduler = new UserAwareBiometricScheduler(tag,
                 BiometricScheduler.SENSOR_TYPE_FACE, null /* gestureAvailabilityDispatcher */,
                 () -> mCurrentSession != null ? mCurrentSession.mUserId : UserHandle.USER_NULL,
                 new UserAwareBiometricScheduler.UserSwitchCallback() {
diff --git a/services/core/java/com/android/server/biometrics/sensors/face/hidl/Face10.java b/services/core/java/com/android/server/biometrics/sensors/face/hidl/Face10.java
index 493c0a0..e957794 100644
--- a/services/core/java/com/android/server/biometrics/sensors/face/hidl/Face10.java
+++ b/services/core/java/com/android/server/biometrics/sensors/face/hidl/Face10.java
@@ -363,7 +363,7 @@
             @NonNull LockoutResetDispatcher lockoutResetDispatcher) {
         final Handler handler = new Handler(Looper.getMainLooper());
         return new Face10(context, sensorProps, lockoutResetDispatcher, handler,
-                new BiometricScheduler(TAG, handler, BiometricScheduler.SENSOR_TYPE_FACE,
+                new BiometricScheduler(TAG, BiometricScheduler.SENSOR_TYPE_FACE,
                         null /* gestureAvailabilityTracker */));
     }
 
@@ -896,6 +896,8 @@
                     boolean success) {
                 if (success) {
                     mCurrentUserId = targetUserId;
+                } else {
+                    Slog.w(TAG, "Failed to change user, still: " + mCurrentUserId);
                 }
             }
         });
diff --git a/services/core/java/com/android/server/biometrics/sensors/fingerprint/aidl/Sensor.java b/services/core/java/com/android/server/biometrics/sensors/fingerprint/aidl/Sensor.java
index 256761a..59e4b58 100644
--- a/services/core/java/com/android/server/biometrics/sensors/fingerprint/aidl/Sensor.java
+++ b/services/core/java/com/android/server/biometrics/sensors/fingerprint/aidl/Sensor.java
@@ -449,7 +449,7 @@
         mHandler = handler;
         mSensorProperties = sensorProperties;
         mLockoutCache = new LockoutCache();
-        mScheduler = new UserAwareBiometricScheduler(tag, handler,
+        mScheduler = new UserAwareBiometricScheduler(tag,
                 BiometricScheduler.sensorTypeFromFingerprintProperties(mSensorProperties),
                 gestureAvailabilityDispatcher,
                 () -> mCurrentSession != null ? mCurrentSession.mUserId : UserHandle.USER_NULL,
diff --git a/services/core/java/com/android/server/biometrics/sensors/fingerprint/hidl/Fingerprint21.java b/services/core/java/com/android/server/biometrics/sensors/fingerprint/hidl/Fingerprint21.java
index d352cda..6feb5fa 100644
--- a/services/core/java/com/android/server/biometrics/sensors/fingerprint/hidl/Fingerprint21.java
+++ b/services/core/java/com/android/server/biometrics/sensors/fingerprint/hidl/Fingerprint21.java
@@ -360,7 +360,7 @@
             @NonNull LockoutResetDispatcher lockoutResetDispatcher,
             @NonNull GestureAvailabilityDispatcher gestureAvailabilityDispatcher) {
         final BiometricScheduler scheduler =
-                new BiometricScheduler(TAG, handler,
+                new BiometricScheduler(TAG,
                         BiometricScheduler.sensorTypeFromFingerprintProperties(sensorProps),
                         gestureAvailabilityDispatcher);
         final HalResultController controller = new HalResultController(sensorProps.sensorId,
@@ -490,19 +490,25 @@
                 !getEnrolledFingerprints(mSensorProperties.sensorId, targetUserId).isEmpty();
         final FingerprintUpdateActiveUserClient client =
                 new FingerprintUpdateActiveUserClient(mContext, mLazyDaemon, targetUserId,
-                        mContext.getOpPackageName(), mSensorProperties.sensorId, mCurrentUserId,
-                        hasEnrolled, mAuthenticatorIds, force);
+                        mContext.getOpPackageName(), mSensorProperties.sensorId,
+                        this::getCurrentUser, hasEnrolled, mAuthenticatorIds, force);
         mScheduler.scheduleClientMonitor(client, new BaseClientMonitor.Callback() {
             @Override
             public void onClientFinished(@NonNull BaseClientMonitor clientMonitor,
                     boolean success) {
                 if (success) {
                     mCurrentUserId = targetUserId;
+                } else {
+                    Slog.w(TAG, "Failed to change user, still: " + mCurrentUserId);
                 }
             }
         });
     }
 
+    private int getCurrentUser() {
+        return mCurrentUserId;
+    }
+
     @Override
     public boolean containsSensor(int sensorId) {
         return mSensorProperties.sensorId == sensorId;
diff --git a/services/core/java/com/android/server/biometrics/sensors/fingerprint/hidl/Fingerprint21UdfpsMock.java b/services/core/java/com/android/server/biometrics/sensors/fingerprint/hidl/Fingerprint21UdfpsMock.java
index 20dab55..273f8a5 100644
--- a/services/core/java/com/android/server/biometrics/sensors/fingerprint/hidl/Fingerprint21UdfpsMock.java
+++ b/services/core/java/com/android/server/biometrics/sensors/fingerprint/hidl/Fingerprint21UdfpsMock.java
@@ -138,8 +138,7 @@
 
         TestableBiometricScheduler(@NonNull String tag, @NonNull Handler handler,
                 @Nullable GestureAvailabilityDispatcher gestureAvailabilityDispatcher) {
-            super(tag, handler, BiometricScheduler.SENSOR_TYPE_FP_OTHER,
-                    gestureAvailabilityDispatcher);
+            super(tag, BiometricScheduler.SENSOR_TYPE_FP_OTHER, gestureAvailabilityDispatcher);
         }
 
         void init(@NonNull Fingerprint21UdfpsMock fingerprint21) {
diff --git a/services/core/java/com/android/server/biometrics/sensors/fingerprint/hidl/FingerprintUpdateActiveUserClient.java b/services/core/java/com/android/server/biometrics/sensors/fingerprint/hidl/FingerprintUpdateActiveUserClient.java
index fd38bdd..a2c1892 100644
--- a/services/core/java/com/android/server/biometrics/sensors/fingerprint/hidl/FingerprintUpdateActiveUserClient.java
+++ b/services/core/java/com/android/server/biometrics/sensors/fingerprint/hidl/FingerprintUpdateActiveUserClient.java
@@ -31,6 +31,7 @@
 
 import java.io.File;
 import java.util.Map;
+import java.util.function.Supplier;
 
 /**
  * Sets the HAL's current active user, and updates the framework's authenticatorId cache.
@@ -40,7 +41,7 @@
     private static final String TAG = "FingerprintUpdateActiveUserClient";
     private static final String FP_DATA_DIR = "fpdata";
 
-    private final int mCurrentUserId;
+    private final Supplier<Integer> mCurrentUserId;
     private final boolean mForceUpdateAuthenticatorId;
     private final boolean mHasEnrolledBiometrics;
     private final Map<Integer, Long> mAuthenticatorIds;
@@ -48,8 +49,9 @@
 
     FingerprintUpdateActiveUserClient(@NonNull Context context,
             @NonNull LazyDaemon<IBiometricsFingerprint> lazyDaemon, int userId,
-            @NonNull String owner, int sensorId, int currentUserId, boolean hasEnrolledBiometrics,
-            @NonNull Map<Integer, Long> authenticatorIds, boolean forceUpdateAuthenticatorId) {
+            @NonNull String owner, int sensorId, Supplier<Integer> currentUserId,
+            boolean hasEnrolledBiometrics, @NonNull Map<Integer, Long> authenticatorIds,
+            boolean forceUpdateAuthenticatorId) {
         super(context, lazyDaemon, null /* token */, null /* listener */, userId, owner,
                 0 /* cookie */, sensorId, BiometricsProtoEnums.MODALITY_UNKNOWN,
                 BiometricsProtoEnums.ACTION_UNKNOWN, BiometricsProtoEnums.CLIENT_UNKNOWN);
@@ -63,7 +65,7 @@
     public void start(@NonNull Callback callback) {
         super.start(callback);
 
-        if (mCurrentUserId == getTargetUserId() && !mForceUpdateAuthenticatorId) {
+        if (mCurrentUserId.get() == getTargetUserId() && !mForceUpdateAuthenticatorId) {
             Slog.d(TAG, "Already user: " + mCurrentUserId + ", returning");
             callback.onClientFinished(this, true /* success */);
             return;
@@ -109,8 +111,10 @@
     @Override
     protected void startHalOperation() {
         try {
-            getFreshDaemon().setActiveGroup(getTargetUserId(), mDirectory.getAbsolutePath());
-            mAuthenticatorIds.put(getTargetUserId(), mHasEnrolledBiometrics
+            final int targetId = getTargetUserId();
+            Slog.d(TAG, "Setting active user: " + targetId);
+            getFreshDaemon().setActiveGroup(targetId, mDirectory.getAbsolutePath());
+            mAuthenticatorIds.put(targetId, mHasEnrolledBiometrics
                     ? getFreshDaemon().getAuthenticatorId() : 0L);
             mCallback.onClientFinished(this, true /* success */);
         } catch (RemoteException e) {
diff --git a/services/tests/servicestests/src/com/android/server/biometrics/sensors/face/aidl/SensorTest.java b/services/tests/servicestests/src/com/android/server/biometrics/sensors/face/aidl/SensorTest.java
index 0891eca..2718bf9 100644
--- a/services/tests/servicestests/src/com/android/server/biometrics/sensors/face/aidl/SensorTest.java
+++ b/services/tests/servicestests/src/com/android/server/biometrics/sensors/face/aidl/SensorTest.java
@@ -33,6 +33,7 @@
 import androidx.test.filters.SmallTest;
 
 import com.android.server.biometrics.sensors.BiometricScheduler;
+import com.android.server.biometrics.sensors.CoexCoordinator;
 import com.android.server.biometrics.sensors.LockoutCache;
 import com.android.server.biometrics.sensors.LockoutResetDispatcher;
 import com.android.server.biometrics.sensors.LockoutTracker;
@@ -82,8 +83,10 @@
                 new Handler(mLooper.getLooper()),
                 BiometricScheduler.SENSOR_TYPE_FACE,
                 null /* gestureAvailabilityDispatcher */,
+                mBiometricService,
                 () -> USER_ID,
-                mUserSwitchCallback);
+                mUserSwitchCallback,
+                CoexCoordinator.getInstance());
         mHalCallback = new Sensor.HalSessionCallback(mContext, new Handler(mLooper.getLooper()),
                 TAG, mScheduler, SENSOR_ID,
                 USER_ID, mLockoutCache, mLockoutResetDispatcher, mHalSessionCallback);
diff --git a/services/tests/servicestests/src/com/android/server/biometrics/sensors/fingerprint/aidl/SensorTest.java b/services/tests/servicestests/src/com/android/server/biometrics/sensors/fingerprint/aidl/SensorTest.java
index a012b8b..d4609b5 100644
--- a/services/tests/servicestests/src/com/android/server/biometrics/sensors/fingerprint/aidl/SensorTest.java
+++ b/services/tests/servicestests/src/com/android/server/biometrics/sensors/fingerprint/aidl/SensorTest.java
@@ -33,6 +33,7 @@
 import androidx.test.filters.SmallTest;
 
 import com.android.server.biometrics.sensors.BiometricScheduler;
+import com.android.server.biometrics.sensors.CoexCoordinator;
 import com.android.server.biometrics.sensors.LockoutCache;
 import com.android.server.biometrics.sensors.LockoutResetDispatcher;
 import com.android.server.biometrics.sensors.LockoutTracker;
@@ -82,8 +83,10 @@
                 new Handler(mLooper.getLooper()),
                 BiometricScheduler.SENSOR_TYPE_FP_OTHER,
                 null /* gestureAvailabilityDispatcher */,
+                mBiometricService,
                 () -> USER_ID,
-                mUserSwitchCallback);
+                mUserSwitchCallback,
+                CoexCoordinator.getInstance());
         mHalCallback = new Sensor.HalSessionCallback(mContext, new Handler(mLooper.getLooper()),
                 TAG, mScheduler, SENSOR_ID,
                 USER_ID, mLockoutCache, mLockoutResetDispatcher, mHalSessionCallback);