Some common pointers from my own experience:
You may want to remove your Binaries, Intermediate, and Saved folders for starting fresh. Start by packaging in development packaging strategy. If that is successful move on to shipping packaging strategy. Check the “Full Rebuild” box in packaging for safety. If development doesn’t pass, review your plugin list. You need to enable a big chunk of the Android plugins usually. If development passes but not shipping, you need to verify your keys. Make sure you follow the key generation methodology.