run this command inside the android folder in your flutter app
.gradlew signingReport
Windows:
keytool -list -v -keystore "C:Usersyourusernamehere.androiddebug.keystore" -alias androiddebugkey -storepass android -keypass android
keytool -list -v -alias androiddebugkey -keystore %USERPROFILE%.androiddebug.keystore
keytool -list -v -keystore ".androiddebug.keystore" -alias androiddebugkey -storepass android -keypass android