Things to keep in mind:
1) Add SHA1 in the firebase project
2) Add SHA-256 in the firebase project
3) Enable Phone option in Sign-in method under Firebase Authentication
4) Make sure to download and add the latest google-services.json file in your project
5) Enable Android Device Verification in https://console.cloud.google.com/
6) Add library implementation "androidx.browser:browser:1.3.0"
https://developer.android.com/jetpack/androidx/releases/browser
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