Is it a code problem or a submission problem?
Thanks for posting! If you still experience any issues with that, and would like us to investigate, please login to your Dev Portal account, raise a "Contact Us" case with us, indicating app name(s) / ID(s), and we'll look into that. Thanks!
Thanks for posting! If you app is live in Amazon Appstore, and can be downloaded on some devices, but not others, it usually means one of the two things:
If you still require any assistance, please login to your Dev Portal account, and use Contact Us form, specifying your app name / ID, and we will investigate. Thanks!