9.0 Camembert – Is the root required for screen sharing / remote desktop on Android Pi

I have tremendous hardship trying to run any type of remote desktop on a Samsung SM-T510 tablet that I just bought (which runs on Android Pi). I've tried Teamviewer, Airdroid and Vysor – and none allow me to do anything meaningful. (I have enabled the developer mode).

I've tentatively concluded that something in the Android Permissions model prevents this sharing from occurring, which seems to mean trying to do it without jailbreaking the phone [ which I don’t want to do ] is futile.

Does anyone know if it is actually possible to do a screen sharing on Android Pi on a phone that is not rooted?