i had an error when building my app to android market place like “Unknown error, contact support for more details.” I need to help!
I was getting this a lot the past few days on my android build and I added all of the flows in AppGyver configuration not just the ones in red. If you have push notifications it could be the need to save the google-services.json file twice when you upload then at the bottom right save and continue button.
Hopefully, that helps!
I suppose this is answered here Not able to publish the newly built component to market place