In my experience, I found that best practice for filling forms of any kind is to fill it by sending 'hotkey' instead of clicking as in many cases clicking seems to be un-reliable or use 'type into' activity or use a combination of 'hotkey' activity with 'type into'.
Tip: If you face more difficulties like this try doing the task by keyboard manually without the mouse as that will allow you to create more reliable processes in future
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