Observed Behavior

Unattended processes using UIAutomation activities such as click, type into or take screenshot do not work.

Cause

A program such as Server Manager set to launch at start up which displays a Windows User Account Control prompt blocks the Robot from making any interaction with the UI. This is happening because the User Account Control prompt is opened in a separate windows desktop to which the Robot does not have access to.

Resolution

Manually or programmatically find the program that displays the UAC prompt and set it to not start automatically to avoid the UAC.