Impossible to perform login

App launches normally on emulator and phone with adb, but when I hit 'login' app craches.

E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.google.cloud.solutions.flexenv, PID: 22180
java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=9001, result=0, data=Intent { (has extras) }} to activity {com.google.cloud.solutions.flexenv/com.google.cloud.solutions.flexenv.PlayActivity}: com.google.android.gms.tasks.RuntimeExecutionException: com.google.android.gms.common.api.ApiException: 12500:
at android.app.ActivityThread.deliverResults(ActivityThread.java:4938)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:4979)
at android.app.servertransaction.ActivityResultItem.execute(ActivityResultItem.java:51)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2044)
at android.os.Handler.dispatchMessage(Handler.java:107)
at android.os.Looper.loop(Looper.java:224)
at android.app.ActivityThread.main(ActivityThread.java:7562)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:539)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:950)
Caused by: com.google.android.gms.tasks.RuntimeExecutionException: com.google.android.gms.common.api.ApiException: 12500:
at com.google.android.gms.tasks.zzu.getResult(com.google.android.gms:play-services-tasks@@17.2.0:15)
at com.google.cloud.solutions.flexenv.PlayActivity.onActivityResult(PlayActivity.java:221)
at android.app.Activity.dispatchActivityResult(Activity.java:8249)
at android.app.ActivityThread.deliverResults(ActivityThread.java:4931)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:4979) 
at android.app.servertransaction.ActivityResultItem.execute(ActivityResultItem.java:51) 
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135) 
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2044) 
at android.os.Handler.dispatchMessage(Handler.java:107) 
at android.os.Looper.loop(Looper.java:224) 
at android.app.ActivityThread.main(ActivityThread.java:7562) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:539) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:950) 
Caused by: com.google.android.gms.common.api.ApiException: 12500:
at com.google.android.gms.common.internal.ApiExceptionUtil.fromStatus(com.google.android.gms:play-services-base@@17.4.0:4)
at com.google.android.gms.auth.api.signin.GoogleSignIn.getSignedInAccountFromIntent(com.google.android.gms:play-services-auth@@18.1.0:9)
at com.google.cloud.solutions.flexenv.PlayActivity.onActivityResult(PlayActivity.java:184)
at android.app.Activity.dispatchActivityResult(Activity.java:8249) 
at android.app.ActivityThread.deliverResults(ActivityThread.java:4931) 
at android.app.ActivityThread.handleSendResult(ActivityThread.java:4979) 
at android.app.servertransaction.ActivityResultItem.execute(ActivityResultItem.java:51) 
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135) 
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2044) 
at android.os.Handler.dispatchMessage(Handler.java:107) 
at android.os.Looper.loop(Looper.java:224) 
at android.app.ActivityThread.main(ActivityThread.java:7562) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:539) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:950) 
I/Process: Sending signal. PID: 22180 SIG: 9

[xiangshen-dk]

Can you please provide more details such as the Android API level and the Logcat messages when the app crashes?
Please note, this sample app needs the following:

Android Studio 4.0.1 from the stable channel.
Android 8.1 (API Level 27) emulator.