Need help on getting % chg on a calculated value in a text visualization

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I have several calculated values on a text visualization but this one doesn't give the right answer.

 

product_reach.pdf

Here is my formula:

UniqueCount(if([item_Description2]='${ItemPromoImpact}',[CustNo], null))

/

UniqueCount([Cust_GeoCoordinate])

Each one of these formulas individually give me the right result. Even if I change the division for a sum or multiplication the formula works well, but when trying to divide it gives me 0