When performing an action recording of a Manual Test Case with parameters I hit a problem where my parameters were not getting mapped to a UI control correctly, giving me an Pass or Fail icon with a warning symbol overlaid on it for the parameterized test step, and an error at the end informing you that some parameters are not mapped to any UI controls.

Turns out this is because I was using the clipboard copy function of the Test Player (by clicking the parameter's value), but I was then performing a right-click paste operation to paste my value. This action is not permitted as it is a recordable action. Instead to make this map correctly I needed to use CTRL-V, or to type in the parameter value to bind the value correctly.

Simple, but caught me out.