Thank you for the information.
The latest Whiteboard can run in iOS and Android IFP with the same user interface. When running on ViewSonic IFP, it should have palm eraser and Whiteboard user can determine its ON/OFF in the setting. Could you please check if you can see the switch inside the setting?
If the palm eraser is ON, but you cannot trigger it, please upgrade to the latest Whiteboard version and try it again. You can also share with us your IFP model number, its firmware version and the Whtieboard version so that we can further check if there is anything wrong with it.
Thanks and hope it helps. Please do let us know if there is anything we can do for you.