It sounds like the Steam overlay is not working for you even when turned on for some reason. When you start OOTP, are you able to toggle the Steam overlay off and on by using Shift+Tab.
Does the overlay actually show up when you do that? If so, can you order then?
If not, you might also try restarting your entire system and then trying again as well. If it still doesn't work, let us know.
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