Publishing App to Amazon App Store - Launch Error

We have launched other apps in the amazon app store, and never had this type of error.

We just tried launching our first Thunkable in the Amazon App Store and received the following error. As an fyi - we deleted all invisible components prior to this submission (were told that sometimes amazon devices had problems with some of these so deleted all prior to uploading APK)

.Amazon App Store’s Message Details On Reason for failure:

"We are unable to test your app as it does not function as intended.

The app exits/ force closes/ freezes/ displays an error message after being launched.
Please fix the issue and re-submit the app."

The App is listed and working fine on the Google Play App Store, so it is something to do with Amazon requirements but clueless as to what it can be.

Thank you for any suggestion or guidance on this

hi ,
did you solved this issue .
Because I am having same , could you assist on this.