Formula Help: Compare if Actual Date is <= Target date but ignore blanks in Actual Date


I want to return a value of TRUE or FALSE in the column 1st Engagement <= 15d, but leave that column blank if Actual 1st Engagement is blank.

I have the formula working to compare the 2 dates, however I am struggling with adding into the formula to ignore blanks in Actual 1st Engagement column. Any suggestions?

Current formula and columns:



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