diff --git a/services/core/java/com/android/server/biometrics/sensors/fingerprint/aidl/FingerprintAuthenticationClient.java b/services/core/java/com/android/server/biometrics/sensors/fingerprint/aidl/FingerprintAuthenticationClient.java
index 9aecf783a881d..05e83da6a107e 100644
--- a/services/core/java/com/android/server/biometrics/sensors/fingerprint/aidl/FingerprintAuthenticationClient.java
+++ b/services/core/java/com/android/server/biometrics/sensors/fingerprint/aidl/FingerprintAuthenticationClient.java
@@ -92,6 +92,7 @@ class FingerprintAuthenticationClient extends AuthenticationClient<AidlSession>
     private long mSideFpsLastAcquireStartTime;
     private Runnable mAuthSuccessRunnable;
     private final Clock mClock;
+    private boolean mDidFinishSfps;
 
     FingerprintAuthenticationClient(
             @NonNull Context context,
@@ -197,8 +198,9 @@ class FingerprintAuthenticationClient extends AuthenticationClient<AidlSession>
 
     @Override
     protected void handleLifecycleAfterAuth(boolean authenticated) {
-        if (authenticated) {
+        if (authenticated && !mDidFinishSfps) {
             mCallback.onClientFinished(this, true /* success */);
+            mDidFinishSfps = true;
         }
     }
 
@@ -490,11 +492,16 @@ class FingerprintAuthenticationClient extends AuthenticationClient<AidlSession>
         if (mSensorProps.isAnySidefpsType()) {
             Slog.i(TAG, "(sideFPS): onPowerPressed");
             mHandler.post(() -> {
+                if (mDidFinishSfps) {
+                    return;
+                }
                 Slog.i(TAG, "(sideFPS): finishing auth");
                 // Ignore auths after a power has been detected
                 mHandler.removeMessages(MESSAGE_AUTH_SUCCESS);
                 // Do not call onError() as that will send an additional callback to coex.
+                mDidFinishSfps = true;
                 onErrorInternal(BiometricConstants.BIOMETRIC_ERROR_POWER_PRESSED, 0, true);
+                stopHalOperation();
                 mSensorOverlays.hide(getSensorId());
             });
         }
diff --git a/services/tests/servicestests/src/com/android/server/biometrics/sensors/fingerprint/aidl/FingerprintAuthenticationClientTest.java b/services/tests/servicestests/src/com/android/server/biometrics/sensors/fingerprint/aidl/FingerprintAuthenticationClientTest.java
index cd4af0a581f81..666d4010e9214 100644
--- a/services/tests/servicestests/src/com/android/server/biometrics/sensors/fingerprint/aidl/FingerprintAuthenticationClientTest.java
+++ b/services/tests/servicestests/src/com/android/server/biometrics/sensors/fingerprint/aidl/FingerprintAuthenticationClientTest.java
@@ -372,6 +372,7 @@ public class FingerprintAuthenticationClientTest {
     @Test
     public void fingerprintPowerIgnoresAuthInWindow() throws Exception {
         when(mSensorProps.isAnySidefpsType()).thenReturn(true);
+        when(mHal.authenticate(anyLong())).thenReturn(mCancellationSignal);
 
         final FingerprintAuthenticationClient client = createClient(1);
         client.start(mCallback);
@@ -382,11 +383,13 @@ public class FingerprintAuthenticationClientTest {
         mLooper.dispatchAll();
 
         verify(mCallback).onClientFinished(any(), eq(false));
+        verify(mCancellationSignal).cancel();
     }
 
     @Test
     public void fingerprintAuthIgnoredWaitingForPower() throws Exception {
         when(mSensorProps.isAnySidefpsType()).thenReturn(true);
+        when(mHal.authenticate(anyLong())).thenReturn(mCancellationSignal);
 
         final FingerprintAuthenticationClient client = createClient(1);
         client.start(mCallback);
@@ -397,11 +400,13 @@ public class FingerprintAuthenticationClientTest {
         mLooper.dispatchAll();
 
         verify(mCallback).onClientFinished(any(), eq(false));
+        verify(mCancellationSignal).cancel();
     }
 
     @Test
-    public void fingerprintAuthSucceedsAfterPowerWindow() throws Exception {
+    public void fingerprintAuthFailsWhenAuthAfterPower() throws Exception {
         when(mSensorProps.isAnySidefpsType()).thenReturn(true);
+        when(mHal.authenticate(anyLong())).thenReturn(mCancellationSignal);
 
         final FingerprintAuthenticationClient client = createClient(1);
         client.start(mCallback);
@@ -415,7 +420,9 @@ public class FingerprintAuthenticationClientTest {
         mLooper.moveTimeForward(1000);
         mLooper.dispatchAll();
 
-        verify(mCallback).onClientFinished(any(), eq(true));
+        verify(mCallback, never()).onClientFinished(any(), eq(true));
+        verify(mCallback).onClientFinished(any(), eq(false));
+        when(mHal.authenticateWithContext(anyLong(), any())).thenReturn(mCancellationSignal);
     }
 
     @Test