Is it possible that My application generates a push-notification while closed

[ShanmugaNathan2023]

No, inorder to achieve that you can use itoo extension

Open Source • Background Tasks: Itoo

Itoo 4.4.2 Sky :octopus: Github Donate [BuildWithLove] [forthebadge] An efficiently designed virtual background execution environment for App Inventor. Powered by the ItooX framework. It allows you to run blocks in background the same way you do normally when the app is active. :star2: Please go through all the details and documentation listed below before you try to use the extension or seek help from others. Efforts have been made to be precise and simple at t…