Open the Android developer verification page in the Google Play Console.
Click "Register package name".

In the dialog that opens, enter your package name and app name and click "Next".
Package name:
App name:

Do you get an error message that this package name has already been registered? Click here to mark the package name registration as completed.
Click "Select key".

In the dialog that opens, there should be only one key listed. Select it and then click "Add key".

If you're being asked to upload a key instead of selecting a key, you don't need to perform the key verification. Click here to cancel the registration and continue with the normal process instead.
Click "Upload APK".

