At the bottom of the 'Foreign Emissary Arrives' pop-up window there are three buttons that appear, from left to right they are: Permit, Execute, Refuse. Obviously the Permit button allows entry. The Execute and Refuse buttons do not allow entry, and cause a favor drop at the city the Emissary originated from.
This pop-up window appears for me at the bottom of my screen, so make sure you have not resized your window in such a way as it is blocking you from seeing the three buttons. Also go to Options >
Messages and make sure they are set to 'Full' messages.
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