I’ve uploaded a video to YouTube showing how to set-up a Windows 10 client’s environment so you can run the Java ‘keytool’ utility from the Command-Prompt
This utility is useful for generating a digital certificate for signing your Android APK and AAB files with.
Video can be found here:
It belongs to a YouTube playlist that has videos showing how to: install Solar2D and launch a game; generate a signed APK/AAB file using Solar2D build.
That playlist can be found here:
I hope these videos help!