Google Sign in Failed Com.Google.Android.Gms.Common.Api.Apiexception: 10:

Google sign in failed com.google.android.gms.common.api.ApiException: 10:

Basically problem is in the SHA1 key put on console please regenerate it and put again properly same project.

1)As the answers, make sure that your actual signed Android apk has the same SHA1 fingerprint as what you specified in the console of your Firebase project's Android integration section (the page where you can download the google-services.json)

For more info, see: Generate SHA-1 for Flutter app

2)On top of that go to the Settings of your firebase project (gear icon right to the Overview at the top-left area. Then switch to Account Linking tab. On that tab link the Google Play to your project.

EDIT:
Account Linking tab doesn't exist any more, instead :

1. Sign in to Firebase.
2. Click the Settings icon, then select Project settings.
3. Click the Integrations tab.
4. On the Google Play card, click Link.

Google SignIn API Exception 10

This error might happen if you are not using same project at console.developers.google and console.firebase.google.com. If project is same at both console make sure you have add your SHA1 Key properly. Get SHA1 from Android studio.

1. Open Android Studio
2. Open your Project
3. Click on Gradle (From Right Side Panel, you will see Gradle Bar)
4. Click on Refresh (Click on Refresh from Gradle Bar, you will see List Gradle scripts of your Project)
5. Click on Your Project (Your Project Name form List (root))
6. Click on Tasks
7. Click on Android
8. Double Click on signingReport (You will get SHA1 and MD5 in Run Bar(Sometimes it will be in Gradle Console))
9. Select app module from module selection dropdown to run or debug your application 
 You also need to get google-services.json from firebase console and put into your project.

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