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It's the most wonderful time of the year - Santalytics 2020 is here! This year, Santa's workshop needs the help of the Alteryx Community to help get back on track, so head over to the Group Hub for all the info to get started!
It is possible that you are not getting the desired results as your main column contains whitespaces. Try using Data Cleasing Tool to clear the field off any redundant spaces before inserting the formula.
Also, are you input fields String or others? IsNULL works on both string and numbers, so type may not be an factor