List as suppression in Analytics

Hello and I apologize if this has been answered in the past, but, ya know, the search functionality of these boards....

Anywell, I have created a list and checked it for Analytics, but I want to use that list to EXCLUDE constituents from my widget. I assumed that I could use Doesn't Contain and my list_no as the text ,9099,  

Sadly, that doesn't seem to actually work. If I flip the operator to Containing, I get the constituents on the list, so I know the list itself is corrrect. Anywell, if anyone has ideas on this front, much appreciation. Thanks!