I need to use a column to capture ID numbers. I need a way to ensure that the answers entered are only numbers and exactly 12 digits in length. I've tried a zillion different formulas but keep getting syntax errors. Can anybody help me?
Try using below formula:
Sometimes comma(,) does not work in formula (I am not sure but it is based on something language on your site). So in that case use semicolon(;) instead of comma(,).