Hi,
> Sell_Amount.Click
While the documentation states that .Click() is equivalent to .Touch() for mobile devices, could you try .Touch() and check if the behavior is the same.
Also, I would expect that after .Touch() / .Click() the virtual keyboard should be displayed and you should be able to see it while the Delay(). Is virtual keyboard displayed?
All at all, are there any specifics for this problematic control when interacting with it manually? Can you contact developers and ask them whether this is regular standard control or customized one?