My problem was resolved late last year. It turned out my "Lookalike Audience" feature wasn't working because I was using a smaller list (I believe 572 is too small). When I switched to a bigger list (1,500 +) it worked fine. Sorry, but I don't recall the cutoff size. It makes sense, it is hard to build a lookalike audience until it has enough data to, well, build a lookalike audience.
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