This is an older post, but we struggled a bit trying to get this working for us too and since this is one of the top results when I was looking, I wanted to leave this here. Below is an example of how you can create the Filter array for Find Sessions Advanced. The lesson we learned the hard way was that only some session property data types (int, float, byte, string) are supported for filtering with Steam. The help text on the Make Literal Session Property Bool tells you this, but it took us a little while to determine why we couldn’t filter by bool session properties. It also doesn’t seem to search for (or properly compare) empty string properties. Good luck.
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