Conditional formatting based on date

Hello Everyone!

I am having some issues attempting to create a measure to conditionally format matrix columns based on date. 

Here is what I am trying to do:

In a Rolling 12 Month Sales visual, I would like to shade all cells where the month/year is before the Client's Go-Live Date, which in my visual ideally would look like this:

I created the following measure:

Before Go-Live = IF(MIN('Calendar'[Date])<MAX('Sales'[Actual Go-Live]),0,1)

And then set up the conditional formatting this way:

But the cells being shaded are those with a value only, and only in the same Month/Year as the client's Go-Live date. The preceding blank cells are not shaded. Here is the result when I turn it on:

How do I get all cells prior to the client's Go-Live date shaded?

Thank you!