Hi Mizzio,
The beta versions are not allowed in Autodesk App Store for Revit. You can submit only stable release.
Hope it helps... You can refer below links for additional information.
https://www.autodesk.com/developer-network/app-store/revit
https://damassets.autodesk.net/content/dam/autodesk/www/adn/pdf/frequently-asked-questions.pdf