I used Android studio to create a release key store. After several attempts in two days, I finally got it to work. The problem is that when creating a signed APK in Android Studio, either by selecting an existing keystore, or by creating a new file, the default for the keystore file is ".jks". This is problem. After I changed this to ".keystore" and generated apk release and then copied SHA1 to the Google console. Finally, a map can be displayed.

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