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Open android studio and click on gradle in right corner > click your project > select app > select tasks > select android > click on signing report > copy our SHA1 and SHA-256 from there.
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Add SHA1 and SHA-256 in your new firebase account .
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Add dependency in build.gradle(:app)
implementation ‘androidx.browser:browser:1.3.0’
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Go to google cloud console , select your project .
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Click on navigation menu and select APis & services and then select Dashboard .
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Click on enable api and services and enable api ” Android Device Verification”.
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Download and replace the latest google-services.json file in your project.
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Clean and rebuild project.
Check if you have completed all 7 steps in your proejct . If your app is live on plays store make sure your firebase project have release SHA1 key too . For more info about release and debug keys you can check. this