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keytool -list -v -keystore "C:\Users\yourusernamehere\.android\debug.keystore" -alias androiddebugkey -storepass android -keypass android
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For Windows Users:
1. Within project folder navigate to the android folder - "cd android"
2. Run "gradlew signingReport"
3. Copy SHA1 and SHA256 values and add them to the project under Project Settings
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Open Android Studio
Open Project
Reveal android folder
Right click gradlew file and select Open in Terminal -
Go to the terminal view and paste - gradlew signingReport