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.
Open Android Studio
Open your Project
Click on Gradle (From Right Side Panel, you will see Gradle Bar)
Click on Refresh (Click on Refresh from Gradle Bar, you will see List Gradle scripts of your Project)
Click on Your Project (Your Project Name form List (root))
Click on Tasks
Click on Android
Double Click on signingReport (You will get SHA1 and MD5 in Run Bar(Sometimes it will be in Gradle Console))
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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