Solved
Test Input Value Incorrect
Any idea why the input value is not recognizing the array?

I've tried with/without the comma, but Appian is still saying there is only 1 item in the list.
Any idea why the input value is not recognizing the array?

I've tried with/without the comma, but Appian is still saying there is only 1 item in the list.
If you want to hardcode arrays then you'll need to write them as arrays. {3, 2} // {"AA", "BB"}, etc.
If the Appian doesn't see the array-indicating curly brackets in the expression box, the parser has no way to understand that the information it's seeing is supposed to be the first value of an array, and will instead assume you meant to provide an array of 1 element (hence just "AA", etc).
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